3/4x+2/3x=5/6

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3/4x+2/3x=5/63/4x+2/3x=5/63/4x+2/3x=5/63/4x+2/3x=5/6乘以12得9x+8x=1017x=10x=10/173/4x+2/3x=5/69x+8x=101

3/4x+2/3x=5/6
3/4x+2/3x=5/6

3/4x+2/3x=5/6
3/4x+2/3x=5/6
乘以12得 9x+8x=10
17x=10
x=10/17

3/4x+2/3x=5/6
9x+8x=10
17x=10
x=10/17

解得10/17

换个方法,看看钟表,
1小时 = 60分钟,1分钟 = 60 秒
这样通分应该更方便

(3/4)x + (2/3)x = 5/6
(45/60)x + (40/60)x = 50/60
45x + 40x = 50
85x = 50
x = 50/85
x = 10/17