3/13×7/5%3/13×2/5简便运算

3/5*2/7+2/5*3/7=3/5*2/7+3/5*2/7=3/5*2/7*2=12/35

7/13*2/5+2/13*6/5=2/13*7/5+2/13*6/5=2/13*(7/5+6/5)=2/13*13/5=2/5

5/7+3/4*5/6-3/8=5/7+5/8-3/8=5/7+1/4=20/28+7/28=27/28

简便计算13x7+3x13=13x(7+3)=13x10=130

5/7+3/13)乘7-3/13=(5/7)*7+(3/13)*7 - 3/13=5+ (3/13)*6=5+ (18/13)=6又5/131/4除以(2/3-2/5)乘3/5=(1/4)÷(10/15 - 6/15)*(3/5)=(1/4)÷(4/15)*(3/5)=(1/4)*(15/4)*(3/5)=9/16

(5/7+3/13)*7-3/13=(5/7)*7+(3/13)*7-3/13=5+(3/13)*6=5+18/13=83/13

7/13*5/11=35/1435/13*4/11=20/14335/143+20/143=55/143满意请采纳

-5*2/3-3/7*0.34+1/3*(-5)+2/7*(-0.68)=-5*(2/3+1/3)-(3/7+4/7)*0.34=-5-0.34=-5.34

合并同类项 5/13*3/7+4/13*5/7 =(5/13+4/13)+(3/7+5/7) =9/13+8/7 =167/91

左半边算出来就是2/5+2/5÷13/2=2/5+2/5*2/13=2/5(1+2/13)=2/5(15/13)=6/13

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