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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

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

2-1/2+3/5 =2-0.5+0.6 =1.5+0.6 =2.1

see

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。

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

二点5×1/2加三点九除以2点2分之一脱式计算 解: 2.5×1/2+3.9÷2-1/2 =2.5×1/2+3.9×1/2-1/2 =(2.5+3.9-1)×1/2 =5.4×1/2 =2.7

4/5+3/8×4/3-3/10 =4/5+1/2-3/10 =8/10+5/10-3/10 =13/10-3/10 =1 (1-4/5×1/12)除以1/3 =(1-1/15)*3 =(14/15)*3 =14/5 【160%-(2/5+40%)】除以1/2 =(160%-4/5)*2 =(4/5)*2 =8/5 【3/4-(7/16-0.25)】×17/9 =(3/4-3/16)*(17/9) =(9/16...

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