解方程3/4x-16.8=20.6 7/8x-0.87=16.9 3÷2x=6.2 (1/2-5/11)*(5/9*2/3) 8.6-3/4x=2.7

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解方程3/4x-16.8=20.6 7/8x-0.87=16.9 3÷2x=6.2 (1/2-5/11)*(5/9*2/3) 8.6-3/4x=2.7
解方程3/4x-16.8=20.6 7/8x-0.87=16.9 3÷2x=6.2 (1/2-5/11)*(5/9*2/3) 8.6-3/4x=2.7

解方程3/4x-16.8=20.6 7/8x-0.87=16.9 3÷2x=6.2 (1/2-5/11)*(5/9*2/3) 8.6-3/4x=2.7
【参考答案】
①3/4x-16.8=20.6
3/4x=37.4
x=748/15
②7/8x-0.87=16.9
7/8x=17.77
x=3554/175
③3÷2x=6.2 (1/2-5/11)*(5/9*2/3)
3÷2x=6.2×(1/22)×(10/27)
3÷2x=31/297
2x=891/31
x=891/62
④8.6-3/4x=2.7
3/4x=5.9
x=118/15