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括号七分之五加十五分之一括号乘七加十五分之八用...

(5/8+1/27)×8+19/27 =5/8×8+1/27×8+19/27 =5+8/27+19/27 =5+(8/27+19/27) =5+1 =6

70/331 解析: 4/9÷(5/9+25/21+7/15) =(4×35)÷(140+25×15+7×21) =140/662 =70/331

简便计算 (1/13+1/15)×5+8÷13 =1/13×5+1/15×5+8/13 =(5/13+8/13)+1/3 =1+1/3 =1又1/3

(5/8)*(3X/7)=(56+x)*(7/15) (5/8)*(15/7)*(3X/7)=56+X [(5*15*3)/(8*7*7)]X=56+x

假设方框里是1,(15+1)*7=112,15+1*7=22,相差90。 假设方框里是2,(15+2)*7=119,15+2*7=29,相差90。 假设方框里是2,(15+n)*7=105+7n,15+n*7=15+7n,相差90。 由此可以得知:无论方框里是什么,相差结果都是90。

1/17+(5/8+1/17)×8 =1/17+5+8/17 =1/17+5/17+8 =8又6/17

(8分之5+6分之5)×15分之4 =(2分之5×4分之1+2分之5×3分之1)×15分之4 =(4分之1+3分之1)×2分之5×15分之4 =12分之7×3分之2 =18分之7

7/25 * (5/7 + 25/4) =7/25 * 5/7 + 7/25 * 25/4 =1/5 + 7/4 =39/20

(5/8+3/7)×8×7 =5/8×8×7+3/7×8×7 =5×7+3×8 =35+24 =59

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