4⼀15+(3⼀4-2⼀5)的脱式简便计算?

2025-03-31 19:33:29
推荐回答(3个)
回答1:

4/15+(3/4-2/5)=4/15-2/5+3/4
=(4-2*3)/15+3/4=-2/15+3/4
=(-2*4+3*15)/4*15=37/60

回答2:

4/15+(3/4-2/5)
=4/15+3/4-2/5
=4/15-6/15+3/4
=-2/15+3/4
=-8/60+45/60
=37/60

回答3:

4/15+(3/4-2/5)
=4/15-2/5+3/4
=4/15-6/15+3/4
=3/4-2/15
=45/60-8/60
=37/60