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简便运算 (5/12×2/5+7/12)÷5/6 (1/2%1/3)÷(1/3+1/9)

5/12-1/6+2/3……=5/12-2/12+8/12=11/123/4+4/9-3/4+4/9=(3/4-3/4)+(4/9+4/9)……交换位置.同分母相加减.=8/9

3/7+1/2-3/7简便计算=(3/7-3/7)+1/2=1/2;5/7-1/6+5/14简便计算7=(10/14+5/14)-1/6=15/14-1/6=90/84-14/84=76/84;=19/21;7/12-(5/6-5/12)简便计算=(7/12+5/12)-5/6=1-5/6=1/6;2/3-1/2-1/18=12/18-9/18-1/18=2/18=1/9;2X-1/8=7/8 2x=1; x=1/2; X-1/9

5/7+5/6+2/7+1/6=(5/7+2/7)+(5/6+1/6)=1+1=21/15*(1/3+1/12)=1/15(4/12+1/12)=1/15*5/12=1/361/4/(3-5/13-8/13)=1/4/(3-1)=1/4/2=1/84/9/【5/6-(1/6+1/3)】=4/9/(5/6-1/6-1/3)=4/9/(4/6-1/3)=4/9/(1/3)=4/3 其实你应当自己做,不会就应努力学,不学永远不会.

5/6*(12/7+2/7)-3/2=5/6*2- 2/3=5/3-2/3=1

(5/6-5/12+3/8)÷1/24=(5/6*24-5/12*24+3/8*24=20-10+9=196/7x4/21+6/7÷21/17 =6/7*(4/21+17/21)=6/7( 35+7/8)x1/7=35*1/7+7/8*1/7=5+1/8=41/8【数学之美】很高兴为你解答,不懂请追问!满意请采纳,谢谢!O(∩_∩)O~

12-2/7+1/7*5=12-2/7+5/7=12+5/7-2/7=12+(5/7-2/7)=12+3/7

12*(3/4+5/6) =12*3/4+12*5/6=9+10=191/12÷(5/6-2/3)-5/16 =1÷(5/6*12-2/3*12)-5/16=1÷(10-8)-5/16=1/2-5/16=3/161/4+1/4÷1/3=1/4+3/4=1

2/5*1/3+2/3÷5/2=2/5*1/3+2/3*2/5=2/5*(1/3+2/3)=2/5*1=2/5

[1-(1/2+1/3)*1/5]÷5/6=(1-5/6)*1/5*6/5=1/6*1/5*6/5=1/25 (2/3-12/7*7/24)÷7/3 =(2/3-1/2)*3/7=1/6*3/7=1/14 祝学习进步

我看都算错了,因该先算中括号里的,因为还有小括号,所以是1除以[2/6+5/6)除以5/12] =1除以[7/6除以5/12} =1除以14/5 所以最后结果是 =5/14 你看是否正确啊

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