12 . ( 64 + 36 ) = 12 . 100 = 1200

= 12 x ( 64 + 36 ) 
= 12 x 100 
= 1200 
Tick nhé

12 x 64 + 12 x 36

= 12 x ( 64 + 36 )

= 12 x 100

= 1200

64 x 12 + 37 x 12 - 12 

= 64 x 12 + 37 x 0

= 0

64 x 12 + 37 x 12 - 12 

= 12 x ( 64 + 36 ) - 12

= 12 x 100 - 12

= 1200 -12

= 1188

\(64\times 12+37\times12-12\)

\(=64\times12+37\times12-12\times1\)

\(=12\times(64+37-1)\)

\(=12\times100\)

\(=1200\)

~ Hok tốt a~

a) 45 x 76 + 90 x 12

= 45 x 76 + 45 x 2 x 12

= 45 x 76 + 45 x 24

= 45 x ( 76 + 24 ) 

= 45 x 100

= 4500

b) 2 x 31 x 12 + 4 x 6 x 69

= 24 x 31 + 24 x 69

= 24 x ( 31 + 69 )

= 24 x 100

= 2400

c) 36 x 28 + 36 x 82 + 64 x 69 + 64 x41

= 36 x ( 28 + 82 ) + 64 x ( 69 + 41 )

= 36 x 110 + 64 x 110

= 110 x ( 36 + 64 )

= 110 x 100

= 11 000

d) 156 ( x + 61)  = 82

=> x + 61 = \(\frac{82}{156}\)

=> x + 61 = \(\frac{41}{78}\)

=> x = \(\frac{41}{78}\)- 61

=> x = \(\frac{-4717}{78}\)

45 x 76 + 90 x 12 = 45 x 76 + 45 x 2 x 12

= 45 x 76 + 45 x 24

= 45 x (76 + 24)

= 45 x 100 

= 4500

b) 2 x 31 x 12 + 4 x  6 x 69 = 62 x 12 + 2 x 12 x 69

= 62 x 12 + 138 x 12

= (62 + 138) x 12

= 200 x 12 = 2400

a, 45 x 76 + 90 x 12

= ( 45 x 12 ) + ( 76 x 90 )

=  540     +   6840

=     7 380

c,

= 36 x ( 28 + 82 ) +  64 x ( 69 + 41 )

= 36 x  110    +   64 x 110

= 110 x ( 36 + 64 )

= 110 x 100

= 11000

\(x\times12+64=364\\ x\times12=364-64\\ x\times12=300\\ x=300:12\\ x=25\)

\(12-\left(x+20\right)=64\)

\(\Rightarrow x+20=12-64\)

\(\Rightarrow x+20=-52\)

\(\Rightarrow x=-52-20\)

\(\Rightarrow x=-72\)

12.x - 64 = 2⁵

12.x - 64 = 32

12.x = 32 + 64

12.x = 96

x = 96 : 12

x = 8

Giúp tớ với tớ cần gấp

\(2.\left(x+3\right)-12=\left(-64\right)\)

\(2.\left(x+3\right)\)         \(=\left(-64\right)+12=-52\)

    \(\left(x+3\right)\)        \(=\left(-52\right):2=-26\)

     \(x\)                 \(=\left(-26\right)-3=-29\)

\(=>A=x^3+3.4x^2+3.4^2x+4^3=\left(x+4\right)^3\)

tại x=6 \(=>A=\left(6+4\right)^3=10^3=1000\)

Ta có: \(A=x^3+12x^2+48x+64\)

\(=x^3+3\cdot x^2\cdot4+3\cdot x\cdot4^2+4^3\)

\(=\left(x+4\right)^3\)

\(=\left(6+4\right)^3=10^3=1000\)