Question

tính nhanh: 64 x 50 + 44 x 100

                __________________

27 x 38 + 146 x 19

 

Answer 1

a. 64 x 50 + 44 x 100

= 32 x 2 x 50 + 44 x 100

= 32 x 100 + 44 x 100

= (32 + 44) x 100

= 76 x 100

= 7600

b. 27 x 38 + 146 x 19

= 27 x 38 + 73 x 19 x 2

= 27 x 38 + 73 x 38

= (27 + 73) x 38

= 100 x 38

= 3800

a/b = 7600/3800 = 2

Answer 2

\(64\times50+44\times100\)

\(=32\times2\times50+44\times100\)

\(=\left(32+44\right)\times100\)

\(=76\times100=7600\)

Answer 3

64x50+44x100

=32x2x50+44x100

=32x(50x2)+44x100

=32x100+44x100

=(32+44)x100

=76x100

=7600

Answer 4

a. 64 x 50 + 44 x 100

= 32 x 2 x 50 + 44 x 100

= 32 x 100 + 44 x 100

= (32 + 44) x 100

= 76 x 100

= 7600

b. 27 x 38 + 146 x 19

= 27 x 38 + 73 x 19 x 2

= 27 x 38 + 73 x 38

= (27 + 73) x 38

= 100 x 38

= 3800