Question

45.12-13.92

31.2

+45.1×13.9的值等于 ______．

Answer 1

45.12-13.92

31.2

+45.1×13.9
=

(45.1-13.9)(45.1+13.9)

31.2

+45.1×13.9，
=

(45.1-13.9)(45.1+13.9)

45.1-13.9

+45.1×13.9，
=45.1+13.9+45.1×13.9，
=685.89．
故答案为：685.89．