假设这个数为X
那么1/8*X+1/12*X=5/12
3/24*X+2/24*X=5/12
5/24*X=5/12
x=2
这个数为2
谢谢采纳
5/12÷(1/8+1/12)
=5/12÷5/24
=5/12×24/5
=2
答:这个数是2。
1/8+1/12=5/24
5/12÷5/24
=5/12×24/5
=2
这个数是2。
验算:2×1/8+2×1/12
=1/4+1/6
=3/12+2/12
=5/12
设这个数是X,那么根据题意得
1/8X+1/12X=5/12
3/24X+2/24X=5/12
5/24X=5/12
X=2
这个数是2
5/12÷(1/8+1/12)
=5/12÷5/24
=5/12×24/5
=2