解:X:8=5:12
12X=8×5……交叉相乘
12X=40
X=40÷12
X=10/3(或者X=3又1/3)
(“/”为分数线,望采纳,谢谢)
X:8=5:12
解 12X=8×5
12X=40
X=40÷12
X=3又3分之1
X:8=5:12
12x=40
x=10/3
12x=8×5
x=8×5÷12
x=3又3分之1
12x=5*8
x=40/12
x=10/3