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a) \(\frac{18}{45}-\frac{4}{12}-\frac{6}{9}-\frac{21}{35}=\frac{2}{5}-\frac{1}{3}-\frac{2}{3}-\frac{3}{5}\)
\(=\left(\frac{2}{5}-\frac{3}{5}\right)-\left(\frac{1}{3}+\frac{2}{3}\right)\)
\(=\frac{-1}{3}-1\)
\(=\frac{-4}{3}\)
b) \(\frac{4}{3}+\frac{3}{5}+\frac{7}{3}+\frac{2}{5}+\frac{1}{3}=\left(\frac{4}{3}+\frac{7}{3}+\frac{1}{3}\right)+\left(\frac{3}{5}+\frac{2}{5}\right)\)
\(=4+1=5\)
c) \(\frac{1}{3}.\frac{4}{5}.\frac{1}{3}.\frac{6}{5}=\frac{8}{75}\)
d) \(\frac{6}{7}.\frac{8}{13}+\frac{6}{7}.\frac{9}{13}-\frac{3}{13}.\frac{6}{7}\)
\(=\frac{6}{7}.\left(\frac{8}{13}+\frac{9}{13}-\frac{3}{13}\right)\)
\(=\frac{6}{7}.\frac{14}{13}\)
\(=\frac{12}{13}\)
1. -x+20 = -(-15)-8+13
=> -x=15-8+13-20
=> -x=0
=> x=0
2. -(-10)+x=-13+(-9)+(-6)
=> 10+x=-13-9-6
=> x = -13-9-6-10
=> x = -38
3. 8-(-12)+10=-(-14)-x
=> 8+12+10=14-x
=> x = 14-8-12-10
=> x = -16
4. -(+12)+(-x)-(-3)=5-(-7)
=> -12-x+3=5+7
=> -x=5+7+12-3
=> -x=21
=> x=-21
5. 14-x+(-10)=-(-9)+(+15)
=> 14-x-10=9+15
=> -x=9+15-14+10
=> -x=20
=> x=-20
6. 12-(-17)+(-3)=-5+x
=> 12+17-3+5=x
=> x=31
7. x-(-19)-(+32)=14-(+16)
=> x+19-32=14-16
=> x=14-16+32-19
=> x=11
8. x-|-15|-|7|=-(-9)+|-5|
=> x-15-7=9+5
=> x=9+5+7+15
=> x=36
9. 15-x+17=13-(-21)
=> 15-x+17=13+21
=> -x=13+21-15-17
=> -x=2
=> x=-2
10. -|-5|-(-x)+4=3-(-25)
=> -5+x+4=3+25
=> x=3+25-4+5
=> x=29
1)x=-30
2)x=-81
3)x=4
4)x=62
5)x=6
6)-13
7)-13
8)-31
9)x=-6;0;6;12
tk minh nha
|Câu d:
x = 3/4 + 1/-12
x = 9/12 - 1/12
x = 8/12
x = 2/3
Vậy x = 2/3
Câu e:
x /14 = 1/7 + (-3)/14
x/14 = 1/7 - 3/14
x/14 = 2/14 - 3/14
x/14 = -1/14
x = - 1/14 x 14
x = -1
Vậy x = -1
1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
1: =-2/9(15/17+2/17)=-2/9
2: =−63+−2190=−63+−2190
=-2-7/30=-67/30
3: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
1) = 35 . 18 - 35 . 18 = 0
2) = 45 - 5 . 12 + 5 . 9 = 45 - 60 + 45 = 30
3) = 24 . 16 - 24 . 5 - 16 . 24 - 16 . 5
= (24 . 16 - 16 . 24) - 5 (24 - 16)
= 0 - 5 . 8 = 0 - 40 = -40
4) = 29 . 19 - 29 . 13 - 19 . 29 - 19 . 13
= (29 . 19 - 29 . 19) - 13 (29 - 19)
= 0 - 13 . 10 = 0 - 130 = -130
5) = 31 . (-18) + 31 . (-81) - 31 . 1
= 31 [(-18) + (-81) - 1]
= 31 . (-100) = -3100
6) = (-12) . 47 + (-12) . 52 + (-12). 1
= (-12) . (47 + 52 + 1)
= (-12) . 100 = -1200
7) = 13 . 45 - 3 . 45
= 45 (13 - 3)
= 45 . 10 = 450
8) = (-48) + 48 . (-78) + 48 . (-21)
= (-48) . 1 + 48 . (-78) + 48 . (-21)
= 48 . (-1) + 48 . (-78) + 48 . (-21)
= 48 . [(-1) + (-78) + (-21)]
= 48 . (-100) = -4800
1) 35x18-5x7x18
= 35x18-35x18
= 35x(18-18)
= 35x0=0
3) 24.(16-5)-16.(24-5)
= 24.16-24.5-16.24-16.5
=[24.16-16.24]-[24.5-16.5]
= [ 24. (16-16)]- [(24-16).5]
= [24.0]-[8.5]
= 0-40=-40
4) 29.(19-13)-19.(29-13)
=29.19-29.13-19.29-19.13
=[ 29.19-19.29]-[ 29.13-19.13]
= [ 29.(19-19)]-[(29-19).13]
=[29.0]-[10.13]
= 0-130= -130
5) 31.(-18)+31.(-81)-31
= 31.(-18)+31.(-81)-31.1
= 31.[(-18)+(-81)-1]
=31.(-100)
= -3100
6);7);8 tương tự 4);5);6)
1) x - 2 = -6
x = -6 + 2
x = -4
2) -5 . x - ( -3 ) =13
-5 . x = 13 + ( -3 )
-5 . x = 10
x = 10 : ( -5 )
x = -2
1, 476 : x =28
x=476 : 28
x=17
Vậy x= 17
,2, x : 26 = 39
x=39 . 26
x=1014
Vậy x= 1014
Thôi nhiều quá mình không trả lời được
~Thôi chúc bạn học giỏi~
1)476:x=28
x=476:28
x=17
2)x:26=39
x=39x26
x=1014
476 : x = 68
x. = 476 : 68
x. = 7
bạn cho nhiều quá mk ko làm đc
x : 26 = 39
x. = 39 x 26
x. = 1014
6.x - 5 = 613
6.x. = 613 + 5
6.x. = 618
x. = 618 : 6
x. = 13
1.476:x=28
x=476*28
x=17
2.x:26=39
x=39*26
x=1014
3. 6*x-5=613
6*x=613+5
6*x=618
x=618:6
x=103
4, x-36:18=12
x-36=12*18
x-36=216
x=216+36
x=252
5. 9*x-13=671
9*x=671+13
9*x=684
x=684:9
x=76
6. x:7-13=57
x:7=57+13
x:7=70
X=70*7
x=490
7. x+13=14
x=14-13
x=1
8. x-19=21
x=21+19
x=40
9. x:13=6
x=6*13
x=78
10.74-x=13
x=74-13
x=61
1)476:x=28
x=476:28
x=17
2)x:26=39
x=39x26
x=1014
3)6.x-5=613
6.x =613+5
6.x =615
1)17
2)1014
3)103
4)14
5)76
6)sai đề tính ko ra
7)1
8)2
9)78
10)61
chúc bạn học tốt
4)x-36:18=12
x-2=12
x=12+2
x=14
nhân chia trước cộng trừ sau nhé, mấy câu kia dễ nên bn tự lm nhé.
1) 476÷x=28
x=476÷28
x=17
2)x÷26=39
x=39×26
x=1014
3)6×x-5=613
6×x=613+5
6×x=618
x=618÷6
x=103
4)x-36÷18=12
x-2=12
x=12+2
x=14
5)9×x-13=671
9×x=671+13
9×x=684
x=684÷9
x=76
\(476:x=28\)
\(x=476:28\)
\(x=17\)
\(x:26=39\)
\(x=39.26\)
\(x=1014\)
\(6x-5=613\)
\(6x=613+5\)
\(6x=618\)
\(x=618:6\)
\(x=102\)
\(x-36:18=12\)
\(x-36=12.18\)
\(x-36=216\)
\(x=216+36\)
\(x=252\)
\(9x-13=671\)
\(9x=671+13\)
\(9x=684\)
\(x=684:9\)
\(x=76\)
\(x:7-13=57\)
\(x:7=57+13\)
\(x:7=70\)
\(x=70:7\)
\(x=10\)
\(x+13=14\)
\(x=14-13\)
\(x=1\)
\(x-19=21\)
\(x=21+19\)
\(x=40\)
\(x:13=6\)
\(x=6.13\)
\(x=78\)
\(74-x=13\)
\(x=74-13\)
\(x=61\)