Question

零点零三六乘以四白五十加零点五五乘以三十六用两两种简便方法

Answer 1

原式
=0.036x450+0.55x36
=0.036x450+0.55x1000x0.036
=0.036x450+550x0.036
=0.036x(450+550)
=0.036x1000
=36

或者
=0.036x1000x0.45+0.55x36
=36x0.45+0.55x36
=36x(0.45+0.55)
=36x1
=36

Answer 2

0.36×450+0.55×360
=0.36×450+550×0.36
=0.36×（450+550）
=0.36×1000
=360

0.36×450+0.55×360
=360×0.45+0.55×360
=360×（0.45+0.55）
=360×1
=360