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\(17.93+116.83+17.23.\)
\(=17\left(93+23\right)+116.83.\)
\(=17.116+116.83.\)
\(=116\left(17+83\right).\)
\(=116.100=11600.\)
Vậy.....
17 . 93 + 116 . 83 +17 . 23
= 17 . (93 + 23) + 116 . 83
= 17 . 116 + 116 . 83
= 116 . (17 + 83)
= 116 . 100
= 11600
\(136\cdot23+136\cdot27-40\cdot36\)
\(=136\cdot\left(23+17\right)-40\cdot36\)
\(=136\cdot40-40\cdot36\)
\(=40\cdot\left(136-36\right)\)
\(=40\cdot100=4000\)
\(17\cdot93+116\cdot83+17\cdot23\)
\(=17\cdot\left(93+23\right)+116\cdot83\)
\(=17\cdot116+116\cdot83\)
\(=116\cdot\left(17+83\right)\)
\(=116\cdot100=11600\)
\(136.23+136.17-40.36\)
\(=136.\left(23+17\right)-40.36\)
\(=136.40-40.36\)
\(=40.\left(136-36\right)\)
\(=40.100\)
\(=100\)
1)
a) 35.23 + 35.41 + 64.65 = 35(23+41) + 64.65 = 35 . 65 + 64.65 =65. 99 = 65(100 - 1 ) = 6500 - 65 = 6435
b) 29.87 - 29.23 + 64.71 = 29(87-23) + 64.71 = 29.64 + 64.71 = 64(71+29) = 64.100= 6400
c) 48.19 + 48.115 + 134.52 = 48(19+115) + 134.52 = 48 . 134+134.52=134(52+48)=134.100=13400
d) 27.121 - 87.27 + 73.34 = 27(121-87) +73 .34 = 27 .34 + 73.34 = 34(73+27)=34.100=3400
e) 125.98-125.46-52.25 = 125(98-46) -52.25 = 125 . 52 - 52.25 =52(125-25) =52.100=5200
f)136.23 + 136.17 - 40.36 = 136(23+17) - 40.36 = 136.40 -40.36 = (136-36)40 = 100.40=4000
g) 17.93 + 116.83 + 17.23 = 17(93+23) + 116.83 = 17.116 + 116.83 =116(83+17) = 116.100=11600
h)19.27 +47.81 + 19.20 = 19(27+20) + 47.81 = 19. 47 + 47.81 = 47(81+19)=47.100 = 4700
i) 87.23 + 13.93 + 70.87 = 87(23+70) + 13.93 = 87 .93 + 13.93 = 93(87+13)=93.100=9300
2)Tìm x
a) [(6x-39):37].4 = 12
(6x - 39) : 37 = 12 : 4 = 3
x =(3.37 + 39): 6 = 25
b) ( x : 3 - 4 ) .5=15
x : 3 -4 = 3
x = (3+4).3 = 21
c) 128 - 3(x+4) =23
3x + 12 = 128 -23 = 105
x = (105-12):3 = 31
d) (3x - 34).73=2.74
3x - 81 = 2.74:73=2.7=14
x =(81 + 14 ) : 3= \(31\frac{2}{3}\)
e) x - [42 + (-28) ] = -8
x - 14 = -8
x- 14 + 14 = -8 + 14
x = 6
1. Tính nhanh:
a, 35.23+35.41+64.65
= 35. (23+41) +64.65
= 35. 64 + 64.65
= 64. ( 35 + 65 )
= 64 . 100
= 6400
b, 29.87 - 29.23 + 64.71
= 29.(87-23) + 64.71
= 29.64 + 64.71
= 64.(29 + 71)
= 64.100
= 6400
c, 48.19 + 48.115 + 134.52
= 48.(19 + 115) + 134.52
= 48.134 + 134.52
= 134.(48 + 52)
= 134.100
= 13400
d, 27.121 - 87.27 + 73.34
= 27.(121 - 87) + 73.34
= 27.34 + 73.34
= 34.(27 + 73)
= 34.100
= 3400
e, 125.98 - 125.46 - 52.25
= 125.(98 - 46) - 52.25
= 125.52 - 52.25
= 52.(125 - 25)
= 52.100
= 5200
f, 136.23 + 136.17 - 40.36
= 136.(23 + 17) - 40.36
= 136.40 - 40.36
= 40.(136 - 36)
= 40.100
= 4000
g, 17.93 + 116.83 + 17.23
= 17.(93+23) + 116.83
= 17.116 + 116.83
= 116.(17 + 83)
= 116.100
= 11600
Lát nữa mình làm tiếp, giờ mình phải đi học rồi
a.17.93+116.83+17.23
=1581+9628+391
=11600
b.15.78.98.76
=1170.98.76
=114660.76
=8714160
c.65-89+87.9.5
=65-89+3915
=(65+(89))+3915
=3891
a) 17.93+116.83+17.23
=(17.93+17.23)+116.83
=17.(93+23)+116.83
=17.116+116.83
=116.(17+83)
=116.100
=11600
b) 125.98-125.46-52.25
=(125.98-125.46)-52.25
=125.(98-46)-52.25
=125.52-52.25
=52.(125-25)
=52.100
=5200
tk nha!
\(a,17.93+116.83+17.23\)
\(=17.\left(93+23\right)+116.83\)
\(=116.\left(17+83\right)\)
\(=116.100\)
\(=11600\)
\(b,19.27+47.81+19.20\)
\(=19.\left(27+20\right)+47.81\)
\(=47.\left(19+81\right)\)
\(=47.100\)
\(=4700\)
\(c,87.23+13.93+70.87\)
\(=87.\left(23+70\right)+13.93\)
\(=93.\left(87+13\right)\)
\(=93.100\)
\(=9300\)
\(d,78.31+78.24+78.17+22.72\)
\(=78.\left(31+24+17\right)+22.72\)
\(=72.\left(78+22\right)\)
\(=78.100\)
\(=7800\)
\(17\cdot93+116\cdot83+17\cdot233\)
\(=17\left(93+233\right)+116\cdot83\)
\(=17\cdot326+116\cdot83\)
=5542+9628
=15170