分数计算
4/5-3/10+2/3
=24/30-9/30+20/30
=35/30
=7/6
4/5-3/10+2/3
=8/10-3/10+2/3
=5/10+2/3
=(15+20)/30
=35/30
=7/6
原式=8/10 -3/10+2/3
=5/10+2/3
=1/2 + 2/3
=3/6+ 4/6
=7/6
=1又6分之1
他们的公分母应该是150
=120/150-45/150+100/150
=75/150+100/150
=175/150
=35/30
=7/6
=1 又1/6
4/5-3/10+2/3 =24/30-9/30+20/30 =35/30 =7/6
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