Question

TÍNH NHANH:

 

A= 72 + 139 + 195 + 216

B=54 x 63 + 54 x 67 - 54 x 40

Answer 1

A = 72+139+195+216

  =622

B=54 x 63 + 54 x 67 - 54 x 40

  = 54 x ( 63+67-40)

= 54 x 90 = 4860

Answer 2

A=72+139+195+216

 A=(72+139)+(195+216)

A=211+411)

A=622

B=54x63+54x67-54x40

B=54x(63+67-40)

B=54x90

4860