Question

36十64x28十72用简便方法

Answer 1

用简便方法就要运用到所学的数学预算方法

乘法交换律。结合律，分配率等

36十64x28十72

=64x28+36十72

=32x56+108

=32x56+128-20

=32x56+32x4-20

=32x（56+4）-20

=32x60-20

=1920-20

=1900

题解思路

Answer 2

36十64x28十72
=36+64x28+36x2
=36x（2+1）+64x（3+25）
=36x3+64x3+64x25
=（36+64）x3+16x4x25
=100x3+16x100
=1900