2/9+1/4÷2/5+3/8 2/3+(4/7-1/2)×1/12 2/3+3/4x=1/6 1/2x÷1/5=3/5 5x-3/5=16/15

问题描述:

2/9+1/4÷2/5+3/8 2/3+(4/7-1/2)×1/12 2/3+3/4x=1/6 1/2x÷1/5=3/5 5x-3/5=16/15

2/9+1/4÷2/5+3/8=2/9+1/4×5/2+3/8=2/9+5/8+3/8=2/9+(5/8+3/8)=2/9+1=1·2/9=11/92/3+(4/7-1/2)×1/12 =2/3+(4/7-1/2)×1/12=2/3+4/7×1/12-1/2×1/12=2/3+1/21-1/24=14/21+1/21-1/24=15/21-1/24=5/7-1/24=120/16...