725: [a nhân 2,5 trừ 15 ] cộng 288,7 biết a = 10
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23 tháng 1 2022
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21 tháng 12 2021
a) 395 x 15 + 85 x 395
= 395 x ( 85 + 15 )
= 395 x 100
= 39500
b) 1357 x 28 + 73 x 1357 - 1357
= 1357 x 28 + 73 x 1357 - 1357 x 1
= = 1357 x ( 28 + 73 - 1)
= 1357 x 100
= 135700
TT
18 tháng 2 2022
a)5*2^2-18:3=20-6=14
b)17*85+15*17-120=17*(120-85+15)=17*20=340
c2^3*17-2^3*14=2^3(17-14)=8*3=24
13 tháng 7 2018
a, 395 x 15 + 85 x 935
= 395 x ( 15 + 85 )
= 395 x 100
= 39500
b, 289 x 47 - 289 x 17
= 289 x ( 47 - 17 )
= 289 x 30
= 8670
k mk nha mk k lại cho
13 tháng 7 2018
a. 395 x 15 + 85 x 395
= 395 x (15 + 85)
= 395 x 100
= 39500
b. 289 x 47 - 289 x 17
= 289 x (47 - 17)
= 289 x 30
= 8670
EC
3
BA
21 tháng 10 2019
\(15+15\cdot2+7\cdot15-100\)
\(=15+30+105-100\)
\(=150-100\)
\(=50\)
21 tháng 10 2019
15 + 15 * 2 + 7 * 15 - 100
= 15 * ( 1+2+7) - 100
= 15*10-10*10
= (15-10) * 10
= 5 * 10
= 50
725:( a x 2,5 -15)+288,7
Nếu a=10 thì!
725:(10x2,5-15)+288,7
=725:10+288,7
=72,5+288,7
=361,2
Chúc bạn may mắn!!!
viet nhu the a