Question

[Vũ Văn Bách]

tinh nhanh 

A 196 x 56 + 196 x 41 + 4 x 196 - 196 = ? 

B 132 x 19 + 132 x 18 + 64 x 132 - 132 = ?

C 145 x 69 + 145 x 32 - 145 = ? 

ai tich cho minh minh tich cho

Answer 1

[phamthiminhtrang]

A : 196 x 56 + 196 x 41 + 4 x 196 - 196 x 1

= 196 x ( 56 + 41 + 4 - 1 )

= 196 x 100

= 19 600

B : 132 x 19 + 132 x 18 + 64 x 132 - 132 x 1

= 132 x ( 19 + 18 + 64 - 1 )

= 132 x 100

= 13 200

C : 145 x 69 + 145 x 32 - 145 x 1

= 145 x ( 69 + 32 - 1 )

= 145 x 100

= 14 500

Answer 2

[Trần Quỳnh Mai]

A = 196 x 56 + 196 x 41 + 4 x 196 - 196

A = 196 x ( 56 + 41 + 4 - 1 )

A = 196 x 100 = 19600

B = 132 x 19 + 132 x 18 + 64 x 132 - 132

B = 132 x ( 19 + 18 + 64 - 1 )

B = 132 x 100 = 13200

C = 145 x 69 + 145 x 32 - 145

C = 145 x ( 69 + 32 - 1 )

C = 145 x 100 = 14500