12.5*5.2+6.5*5.2+520%如何简便计算还有 7.5*99.9 3/8-1/7+5/8-5/7 3-(3/8+1/3)-5/8 1/2*11/20+1/2÷20/49 (5/6+3/7-2/3)÷1/42 快

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12.5*5.2+6.5*5.2+520%如何简便计算还有 7.5*99.9 3/8-1/7+5/8-5/7 3-(3/8+1/3)-5/8 1/2*11/20+1/2÷20/49 (5/6+3/7-2/3)÷1/42 快
12.5*5.2+6.5*5.2+520%如何简便计算
还有 7.5*99.9 3/8-1/7+5/8-5/7 3-(3/8+1/3)-5/8 1/2*11/20+1/2÷20/49 (5/6+3/7-2/3)÷1/42 快

12.5*5.2+6.5*5.2+520%如何简便计算还有 7.5*99.9 3/8-1/7+5/8-5/7 3-(3/8+1/3)-5/8 1/2*11/20+1/2÷20/49 (5/6+3/7-2/3)÷1/42 快
12.5*5.2+6.5*5.2+520%
=12.5*5.2+6.5*5.2+5.2
=5.2*(12.5+6.5+1)
=5.2*20
=104

12.5*5.2+6.5*5.2+5.2*1
=(12.5+6.5+1)*5.2
=20*5.2
=104