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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...

()+5/17+3/15=2 ()=2-(5/17+3/15) ()=2-(75-51)/255 ()=2-24/255 ()=2-8/85 ()=1又85分之77

5/4×(7/9+4/15) =5/4×7/9+5/4×4/15 =35/36+1/3 =35/36+12/36 =47/36

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

(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

(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

(4/5+1/4)÷7/3+7/10 =(16/20+5/20)÷7/3+7/10 =21/20x3/7+7/10 =9/20+7/10 =9/20+14/20 =23/20 望采纳,谢谢!

(1/6+5/7)+(5/6+2/7) =(1/6+5/6)+(5/7+2/7) =1+1 =2

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

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