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6: \(9,5\times4,7+9,5\times4,3+9,5\)
\(=9,5\times\left(4,7+4,3+1\right)\)
\(=9,5\times10=95\)
5: \(32\times1,25\times2,5+0,476+0,524\)
\(=80\times1,25+1\)
=100+1
=101
4: \(3,5\times0,5+3,5\times0,125+3,5\times22,5\times4\)
=3,5x(90+0,5+0,125)
=3,5x90,625
=317,1875
3: \(32\times1,25\times2,5+\frac{54}{10}\times8,7+5,4\times3,3-10,8\)
\(=40\times2,5+5,4\times8,7+5,4\times3,3-5,4\times2\)
=100+5,4x(8,7+3,3-2)
=100+5,4x10
=100+54
=154
2: \(15,25\times0,5+15,25\times0,25+15,25\times0,125+15,25\times6\)
=15,25x(0,5+0,25+0,125+6)
=15,25x6,875
=104,84375
1: 2020x0,56+0,34x6060+8080x0,85+2020x5,02
=2020x0,56+2020x1,02+2020x3,4+2020x5,02
=2020x(0,56+1,02+3,4+5,02)
=2020x10
=20200
A)
2,5 x 16,27 x 4
=(2,5 x 4) x 16,27
=10x16,27
=162,7.
B)
0,25 x 1,25 x 4 x 8
=(0,25 x 4) x (1,25 x 8)
=1 x 10
=10.
C)
32,5 x 6,5 + 3.5 x 32,5
= 32,5 x (6,5+3,5)
=32,5 x 10
= 325
D)
6,7 x 9,55 + 9,45 x 16,7 + 16,7
= 6,7 x 9,55 + (9,45 + 1) x 16,7
= 6,7 x 9,55 + 10,45 x 16,7
= 63,985 + 174,515
= 238,5
1) 2,75 - 5/6 × 2/5 = 2,75 - (5/6) × (2/5) = 2,75 - 1/3 = 2,75 - 0,33 = 2,42
2) 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 3/4) - 3/5 = 1,25 - (5/6 - 9/12) - 3/5 = 1,25 - (10/12 - 9/12) - 3/5 = 1,25 - 1/12 - 3/5 = 1,25 - 0,08 - 0,6 = 1,25 - 0,68 = 0,57
3) 4/9 × 0,75 + 8/5 + 3,125 = (4/9) × 0,75 + 8/5 + 3,125 = 0,44 + 8/5 + 3,125 = 0,44 + 1,6 + 3,125 = 0,44 + 4,725 = 5,165
4) 1,125 - 4/7 - 0,12 = 1,125 - (4/7) - 0,12 = 1,125 - 0,57 - 0,12 = 0,435 - 0,12 = 0,315
5) (1/3 + 0,4) × 3,5 + (1/6 + 0,75) × 6/5
Ta có:
x − 3 , 5 = 12 , 3 : 1 , 25 x − 3 , 5 = 9 , 84 x = 9 , 84 + 3 , 5 x = 13 , 34
Vậy x = 13,34.
Đáp án C
3,5 x 8 x 3 x 1,25
= ( 1,25 x 8 ) x ( 3 x 3,5 )
= 10 x ( 3 x 3,5 )
= 10 x 10,5
= 105
nha bn
\(3,5\times8\times3\times1,25\)
\(=\left(8\times1,25\right)\times\left(3,5\times3\right)\)
\(=10\times10,5\)
\(=105\)
a) X : 0,25 + X x 11 = 24
X x 4 + X x 11 = 24
X x (4 + 11) = 24
X x 15 = 24
X = 24 : 15
X = 1,6
b) X x 8,01 - X : 100 = 38 ( Sửa - thành =)
X x 8,01 - X x 0,01 - 38
X x ( 8,01 - 0,01)=38
X x 8 = 38
X= 38 : 8
X=4,75
a) X : 0,25 + X x 11 = 24
X x 4 + X x 11 = 24
X x (4 + 11) = 24
X x 15 = 24
X = 24 : 15
X = 1,6
b) X x 8,01 - X : 100 = 38 ( Sửa - thành =)
X x 8,01 - X x 0,01 - 38
X x ( 8,01 - 0,01)=38
X x 8 = 38
X= 38 : 8
X = 4,75
c) 2,3 : ( 2,8 : X ) = 57,5
2,8 : X = 2,3 : 57,5
2,8 : X = 0,04
X = 2,9 : 0,04
X = 70
d) 0,16 : ( X : 3,5 ) = 2,8
0,16 : X x 3,5 = 28
0,16 : X = 2,8 : 3,5
0,16 : X = 0,8
X = 0,16 : 0,8
X = 0,2
a,19,75 x 0,4 x 2,5 b,9,67 x80 x 1,25
=19,75 x 1 =9,67 x 100
=19,75 =967
c,15,85 x 6,85 - 6,85 x 3,5 -2,35 x 6,85 d,1,25 x 0,35 x 0,8 +0,5614 +1,4386
=6,85 x (15,85 - 3,5 - 2,35) =0,35 x (1,25 x 0,8) + (0,5614 + 1,4386)
=6,85 x 10 =0,35 x 1 + 2
=68,5 =0,35 +2
=2,35
a,19,75 x 0,4 x 2,5 b,9,67 x80 x 1,25
=19,75 x 1 =9,67 x 100
=19,75 =967
c,15,85 x 6,85 - 6,85 x 3,5 -2,35 x 6,85 d,1,25 x 0,35 x 0,8 +0,5614 +1,4386
=6,85 x (15,85 - 3,5 - 2,35) =0,35 x (1,25 x 0,8) + (0,5614 + 1,4386)
=6,85 x 10 =0,35 x 1 + 2
=68,5 =0,35 +2
=2,35
a: \(80\times2,5-80\times1,25-80\)
\(=80\times\left(2,5-1,25-1\right)\)
\(=80\times\left(1,25-1\right)=80\times0,25=20\)
b: \(26,12\times3,5-26,12\times2,4-26,12\)
\(=26,12\times\left(3,5-2,4-1\right)\)
\(=26,12\times0,1=2,612\)
\(0,25\times1,25\times8\times40+3,5\times67+3,5\times31+7\times1\)
\(=\left(0,25\times40\right)\times\left(1,25\times8\right)+3,5\times\left(67+31\right)+7\)
\(=10\times10+3,5\times98+7\)
\(=100+343+7\)
\(=450\)
450
0,25 x 1,25 x 8 x 40 + 3,5 x 67 + 3,5 x 31 + 7 x 1
= (0,25 x 40)x(1,25 x 8) + 3,5 x (67 + 31) + 7
= 10 x 10 + 3,5 x 98 + 7
= 100 + 343 + 7
= 100 + 350
= 450