2.5x3⼀7+0.4÷2又1⼀3的简便方法怎么做?

2025-04-02 17:29:39
推荐回答(2个)
回答1:

2.5×3/7+0.4÷2又1/3
=2.5×3/7+0.4×3/7
=(2.5+0.4)×3/7
=2.9×3/7
=87/70
=1又17/70

回答2:

2.5x3/7+0.4÷2又1/3
=2.5×3/7+0.4÷7/3
=2.5×3/7+0.4×3/7
=(2.5+0.4)×3/7
=2.9×3/7
=29/10×3/7
=87/70