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1) - 135 - 2017 + 9 x 15
= - 135 - 2017 + 135
= ( - 135 + 135 ) - 2017
= 0 - 2017
= - 2017
2) - 39 x ( 250 - 87 ) - 61 x ( 240 + 97 )
= - 39 x 163 - 61 x 337
= - 6357 - 20557
= - 26914
3) 65 + 135 - 35 + 9 x 35
= 65 + 135 - 35 + 315
= ( 65 + 315 ) + ( 135 - 35 )
= 380 + 100
= 480
4) - 15 x ( 23 + 157 ) + 15 x 157 - 15 x 7
= 15 x ( - 180 ) + 15 x 157 - 15 x 7
= 15 x ( - 180 + 157 - 7 )
= 15 x ( - 30 )
= - 450
a) \(48.19+48.15+134.52\)
\(=48\left(19+15\right)+6968\)
\(=48.34+6968\)
\(=1632+6968\)
\(=8600.\)
b) \(27.121-87.27+73.34\)
\(=27\left(121-87\right)+73.34\)
\(=27.34+73.34\)
\(=34\left(27+73\right)\)
\(=34.100\)
\(=3400.\)
c) \(125.98-125.46-52-25\)
\(=125\left(98-46\right)-52-25\)
\(=125.52-52-25\)
\(=52\left(125-1\right)-25\)
\(=52.124-25\)
\(=6448-25\)
\(=6423.\)
d) \(136.23+136.17-40.36\)
\(=136\left(23+17\right)-40.36\)
\(=136.40-40.36\)
\(=40\left(136-36\right)\)
\(=40.100\)
\(=4000.\)
e) \(66.25+5.66+66.14+33.94\)
\(=33\left(2.50+5.2+14.2+94\right)\)
\(=33\left(50+10+28+94\right)\)
\(=33.182\)
\(=6006.\)
35 . 23 .+ 35 . 41 + 64 . 65 =35(23+41)+64.65=35.64+64.65=64(35+65)=64.100=6400
29 . 87 - 29 . 23 + 64 . 71 =29(87-23)+64.71=29.64+64.71=64(29+71)=29.100=2900
27 . 121 - 87 . 27 + 73 . 34 =27(121-87)+73.34=27.34+73.34=34(27+73)=34.100=3400
35 . 23 + 35 . 41 + 64 . 65 29 . 87 - 29 . 23 + 64 . 71
= 35 . ( 23 + 41 ) + 64 . 65 = 29 . ( 87 - 23 ) + 64 . 71
= 35 . 64 + 64 . 65 = 29 . 64 + 64 . 71
= 64 . ( 35 + 65 ) = 64 . ( 29 + 71 )
= 64 . 100 = 64 . 100
= 6400 = 6400
27 . 121 - 87 . 27 + 73 . 34
= 27 . ( 121 - 87 ) + 73 . 34
= 27 . 34 + 73 . 34
= 34 . ( 27 + 73 )
= 34 . 100
= 3400
Đó chính là câu trả lời bạn nhớ tích cho mình nhé
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) 27.121-87.27+73.34
=27.(121-87)+73.34
=27.34+73.34
=34.(27+73)
=34.100
=3400
\(23.157+46.15-23.87\)
\(=23.157+23.30-23.87\)
\(=23\left(157+30-87\right)\)
\(=23.100\)
\(=2300\)
Hok tot
23 x 157 + 46 x 15 - 23 x 87
= 23 x 157 + 23 x 30 - 23 x 87
= 23 x ( 157 + 30 - 87 )
= 23 x 100
= 2300