www.gsyw.net > 简便计算 1/5÷(1%1/3×1/2) 9/10×【7/8÷(4/5+1/4)】 (1/4%1/4...

简便计算 1/5÷(1%1/3×1/2) 9/10×【7/8÷(4/5+1/4)】 (1/4%1/4...

1/5-1/5÷3=1/5-1/5*1/3=1/5*(1-1/3)=1/5*2/3=2/154/15÷4+3/4*4/15=4/15*1/4+3/4*4/15=4/15*(1/4+3/4)=4/15(1/2+3/4+1/8)*16=1/2*16+3/4*16+1/8*16=8+12+2=225/7*7/8-7/8*5/7=7/8*(5/7-5/7)=7/8*0=05/12*1/9*24=10*1/9=10/91-3/5÷3/5*7/8=1-3/5*5/3*7/8=1-7/8=1/8

2/5x1/8÷5/3÷1/8=2/5x1/8x3/5x8=6/25; (1.25+5/24-3/4)÷1/4=5/4x4+5/24x4-3/4x4=5+5/6-3=2又6分之5; 【5/7÷(5/7-3/4)]÷6/7=[5/7x7/5-5/7x4/3]x7/6=[1-20/21]x7/6=1/21x7/6=1/18

8/9÷[2/5+1/10)*4/3] =8/9÷4/3÷(2/5+1/10) =2/3÷(3/10) =20/9

原式=1/2-1/3+1/3-1/4+1/4-1/5++1/9-1/10(因为1/2*3=1/6=3/6-2/6,所以1/2*3=1/2-1/3) =1/2-1/10 =2/5

你好!除以一个数等于乘以它的倒数,然后就全都约掉了8/15÷2/9÷4/5=8/5*9/2*5/4=1/3 (7/8+3/4)÷1/4=(7/8+6/8)*4=13/28/13÷7+1/7*6/13=8/13*1/7+1/7*6/13=1/7(8/13+6/13)=2/13 仅代表个人观点,不喜勿喷,谢谢.

3/4÷[3/5+2/5*(1-3/8)] =3/4÷【3/5+2/5X5/8】=3/4÷【3/5+1/4】=3/4÷17/20=3/4X20/17=15/17

(7/10+1/2)÷3/8-1/5 =(7/10+1/2)*8/3-1/5 =7/10*8/3+1/2*8/3-1/5 =28/15+4/3-1/5 =28/15+20/15-3/15 =45/15 =3 8/45*5/8+3/7÷9/28 =8/45*5/8+3/7*28/9 =1/9+4/3 分数乘法可以约简 =1/9+12/9 =13/9 3/10÷(2/5+4/15)-1/5 =3/10÷(6/15+4/15)-1/5 括号前是除法的,只能先算括号内的.=3/10÷10/15-1/5 =3/10*15/10-1/5 =45/100-20/100 =25/100 =1/4

-3又1/2÷7/8*(-3/4) =-(7/2)(8/7)(-3/4)=3;计算:(-8)÷(-1又1/9)*0.125=(-8)*(1/8)/(-10/9)=-1/(-10/9)=9/10

5/2*3*4+7/3*4*5+…+17/8*9*10+19/9*10*11=(1/2*4+1/3*4)+(1/3*5+1/4*5)+..+(1/8*10+1/9*10)+(1/9*11+1/10*11)=(1/2)*[(1/2-1/4)+(1/3-1/5)+.(1/8-1/10)+(1/9-1/11)]+[(1/3-1/4)+.+(1/9-1/10)+(1/10-1/11)]=(1/2)*(1/2+1/3-1/10-1/11)+(1/3-1/11)=1/4+1/2-1/20-3/22=31/55

1÷(2*5)+1÷(3*6)+1÷(4*7)+……+1÷(7*10)=1/3 *(1/2-1/5) +1/3*(1/3-1/6) +1/3*(1/4-1/7)+……+1/3*(1/7-1/10)=1/3 *(1/2 -1/5 +1/3 -1/6 +1/4 -1/7 +……+1/7-1/10)=1/3 *(1/2+1/3+1/4-1/8-1/9-1/10)=1/3 *269/360=269/1080

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