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4/7×括号3/8%1/5括号加0.8用递等式计算

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10+9+8+7+6+5+4+3+2+1 =(10+1)+(9+2)+(8+3)+(7+4)+(7+4)+(6+5) =11+11+11+11+11+11 =11×6 =66

0-0.1+0.2-0.3+0.4-0.5+0.6-0.7+0.8-0.9+1 =(0.2-0.1)+(0.4-0.3)+(0.6-0.5)+(0.8-0.7)+(1-0.9) =0.1X5 =0.5

3/8+2/7-1/8+5/7 =(3/8-1/8)+(2/7+5/7) =1/4+1 =1又1/4 -----------------------------------------------------------------------------------------

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