Question

1.tính nhanh

a) 2 x 16 x 50 x 25

b) 35 x 24 + 35 x 76 + 55 x 19 + 55 x 81

c) 6 x 25 x 4 + 4 x 19 x 6 - 2 x 14 x 12

d) 19 x 64 + 76 x 34

e) 864 x 48 - 432 x 96 / 864 x 48 x 432

Answer 1

b) 35 x 24 + 35 x 76 +55 x 19 +55 x 91

= 35 x ( 24 + 76 ) + 55 x ( 19 + 91 )

= 35 x100 +55 x 100

= 100 x ( 55 + 35 )

= 90 x 100 =9 000

c) \(6\cdot25\cdot4+4\cdot19\cdot6-2\cdot14\cdot12\)

\(=24\cdot25+24\cdot19-24\cdot14\)

\(=24\left(25+19-14\right)\)

\(=24\cdot30=720\)

d) \(19\cdot64+76\cdot34\)

\(=76\cdot19+76\cdot34\)

\(=76\left(19+34\right)=76\cdot53=4028\)

Answer 2

a) 2 x 16 x 50 x 25

= ( 2 x 50 ) x ( 16 x 25 )

= 100 x 400 

= 40 000