154:nhân 2+ 115+250=
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Cau 1 : 250 x 15 + 250 x 50 + 250 x 35 Cau 2 : 248 x 154 - 248 x 54
= 250 x ( 15 + 50 +35 ) = 248 x ( 154 - 54 )
= 250 x 100 = 248 x 100
= 25000 = 24800.
Hoc tot nhe ban !
250 x 15 +250 x 50 +250 x 35 = 25000 , 248 x 154 - 248 x 54 = 24800
1. Tính nhanh
a.325.6+6.560+6.115
=6*(325+560+115)
=6.1000
=6000
b.123:7+154:7+413:7
=(123+154+413):7
=690:7
=690/7
a) 325 * 6 + 6 * 560 + 6 * 115
= 6 * ( 325 + 560 + 115 )
= 6 * 1000
= 6000
b) 133 : 7 + 154 : 7 + 413 : 7
= ( 137 + 154 + 413 ) : 7
= 504 : 7
= 72
5.x=420
x=420:5
x=84
12.x=420
x=420:12
x=35
7.x=154
x=154:7
x=22
11.x=154
x=154:11
x=14
2.x=154
x=154:2
x=77
a) = 8 . 15 - [115- 72 ]
= 8 . 15 - [115- 49 ]
= 120 - 56
= 64
b) = 100 : {250 : [450 - (2.125 - 8.25)]}
= 100 : {250 : [450 - (250 - 200 )]}
= 100 : {250 : [450 - 50]}
= 100 : {250 :400}
= 100 : 0,265
= 0,00265
=
\(a,2^3.15-\left[115-\left(12-5\right)^2\right]\)
\(=8.15-\left[115-\left(12-5\right)^2\right]\)
\(=120-\left[115-7^2\right]\)
\(=120-\left[115-49\right]\)
\(=120-66\)
\(=54\)
\(b,100:\left\{250:\left[450-\left(2.5^3-2^3.25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(2.125-8.25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(250-200\right)\right]\right\}\)
\(=100:\left\{250:\left[450-50\right]\right\}\)
\(=100:\left\{250:400\right\}\)
\(=100:0,625\)
\(=160\)
\(2^3.15-\left[115-\left(12-5\right)^2\right]=8.15-\left[115-7^2\right]=120-\left[115-49\right]=120-66=54\)
\(100:\left\{250:\left[450-\left(4.5^3-2^2.25\right)\right]\right\}=100:\left\{250:\left[450-\left(4.125-4.25\right)\right]\right\}=100:\left\{250:\left[450-\left(500-100\right)\right]\right\}\)
\(=100:\left[250:\left(450-400\right)\right]=100:\left(250:50\right)=100:5=20\)
2154 -(X+356) x 2=154 x 6
=2154 - (X+356) x 2=924
=2154 - ( X +356)=924:2
=2154 - (X + 356) =462
=X+356=2154 -462
=X+356=1692
=X=1692 - 356
=>X=1336
k mik nhé
154 x 2 + 115 + 250 = 673