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(1/15+1/12)*3+1/15X=4/5 帮忙解

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1/15x(1/3+1/12) =1/15x(4/12+1/12) =1/15x5/12 =1/36

3×(2/15+1/12)-2/5 =3×2/15+3×1/12-2/5 =2/5+1/4-2/5 =(2/5-2/5)+1/4 =0+1/4 =1/4

简便计算 3×(2/15+1/12)+1/4 =3x2/15+3x1/12+1/4 =2/5+1/4+1/4 =2/5+1/2 =4/10+5/10 =9/10

3/4 19/15 1/2 -3/175 望采纳

=7/12-(2.1/4+5/4) =7/12-(1.6+4) =7/12-4.6 =4.652-4.6 =0.052

(1)5/7+5/6+2/7+1/6 =5/7+2/7+5/6+1/6=2 (2)1/15x(1/3+1/12)=1/15x5/12=1/36 (3)1/3+3除以1/2 (4)3.7乘以6/5+1.3除以5/6 (5)1/4除以3-5/13-8/13) (6)0.5乘以(3/5+6/25)

如图

5+4=12-3=15-6

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