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(1/15+1/12)*3+1/15X=4/5 帮忙解

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

解:∵A × B = C , X + Y = Z ∴3/4 x 4/5 ÷ (1/12 + 4/15) = 3/5 ÷ (5/60 + 16/60) = 3/5 ÷ 21/60 = 3/5 ÷ 7/20 = 3/5 × 20/7 = 12/7

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

如图

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

3/4 19/15 1/2 -3/175 望采纳

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

zmjp

1/2+1/6=2/3 1/4+5/12=2/3 1/5+7/15=2/3 中间的数填1/3

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