2.5x (0.7x0.4) 简算

2025-02-25 19:20:18
推荐回答(1个)
回答1:

2.5x (0.7x0.4)

=25×7×4÷1000
=25×4×7÷1000
=100×7÷1000
=700÷1000
=0·7