这道题用简便运算怎么做?

2025-06-20 16:18:56
推荐回答(1个)
回答1:

7.2×0.2+2.4×1.4
=2.4×0.6+2.4×1.4
=2.4×(0.6+1.4)
=2.4×2
=4.8

17.8÷(1.78×4)

=1.78÷1.78÷4
=1÷4
=0.25