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1/2加2/5,减3/10加3/5的脱式计算.

脱式计算 1/2+2/5-3/10+3/5 =(1/2-3/10)+(2/5+3/5) =1/5+1 =1又1/5

1-3/10-2/5=3/10

=5/10-2/10+3/10 =6/10 =3/5

3分之2+4分之1-12分之5 =12分之8+12分之3-12分之5 =12分之(8+3-5) =12分之6 =2分之1

2/3乘以中括号3/10除以小括号1/3+2/5小括号中括号=2/3*【3/10/(1/3+2/5)】=2/3*【3/10/(11/15)=2/3*9/22=3/11。

10分之9减(5分之1加2分之1),脱式计算 10分之9减(5分之1加2分之1 =9/10-(2/10+5/10) =9/10-7/10=2/10=1/5

5又3/5-2又2/3+3又1/6 =5又3/5+(3又1/6-2又2/3) =5又3/5+1/2 =6.1

5/6减去1/4加1/3 =5/6-1/4+1/3 =10/12-3/12+4/12 =9/12 =3/4 7/9加3/5减(7/9加3/5) =7/9-7/9+(3/5-3/5) =0+0 =0

1又4/5+3又11/15+5又3/10 =1又24/30+3又22/30+5又9/30 =10又25/30 =10又5/6 2又1/4*9.6/9又3/5 =2又1/4x9.6÷9.6 =2又1/4

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