5/8 3/8×7/15的简便运算？ 72x15-52 15的简便方法
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小括号5/8加3/7小括号乘八乘七,怎么简便运算?8*5/8+3/7*7=5+3=8
72x15=72x5x3=360x3=1080
七分之十五加八分之九乘以九分之五加八分之三 怎么简便计算 搜狗问问通分计算是最简便的算法了.
8*7/15减7*2/15怎么简便计算8*7/15减7*2/15 =8*7/15-2*7/15 =(8-2)*7/15 =6*7/15 =15/4
455/35*15的简便运算?首先35跟15都有公因子5,所以可以先约去5,原式=455/7*3,又可观察到455是7的倍数,=65*3=195.
八分之三乘九十七加四乘零点三七五减八分之十五的简便运.3/8*97+4*3/8-15/8=3/8*(97+4)-3/8*5=3/8*(97+4-5)=3/8*96=3/12=1/4 楼主看不懂就问吧,0.375=3/8
5/8 - (8/15 - 3/8)5/8-(8/15-3/8) = 5/8十3/8一8/15 =1一8/15 =7/15
(1)1.25*0.25*32(2)5/7+9/8*5/9+3/8(3)(3/7+5/14)/11/21.(1)1.25*0.5*32 =1.25*0.5*(8*4) =(1.25*8)*(0.5*4) =10*2 =20 (2)5/7+9/8*5/9+3/8 =5/7+5/8+3/8 =5/7+(5/8+3/8) =5/7+1 =12/7 (3)(3/7+5/14)/11/21-2/5 =(3/7)/(11/21)+(5/14)/(11/21)-2/5 =9/11+15/22-2/5 =3/2-2/5 =15/10-4/10 =11/10
分数简便计算(1) 1/2÷4/5+(2/9+3/8) =1/2*5/4+(2/9+3/8) =5/8+(2/9+3/8) =(5/8+3/8)+2/9 =1+2/9 =1又2/9 (2) 2 - 5/11÷9/22-5/9 =2-5/11*22/9-5/9 =2-10/9-5/9 =2-(10/9+5/9) =2-1又2/3 =1/3 (3) (1/2+1/12 - 7/12)÷7 =[1/2+(1/12-7/12)]÷7 =[1/2-1/2]÷7 =0÷7 =0 (4)(5/6 - 3/4)÷5/12+5/9 =5/6*12/5-3/4*12/5+5/9 =2-9/5+5/9 =1/5+5/9 =34/45 (5)3/7÷[(2/3 - 1/2)*6/7] =3/7÷[2/3*6/7-1/2*6/7] =3/7÷[4/7-3/7] =3/7÷1/7 =3/7*7 =3
简便计算!!!!要过程!!!!题都差不多 1、原式=1/(8*9)+1/(9*10)+…+1/(12*13)=1/8-1/9+1/9-1/10+…-1/13= 1/8-1/13=5/117 2、原式=1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7) =1-1/2+1/2-1/3+…-1/7=1-1/7=6/7 3、原式=1/3+1/6+1/3[1/(2-5)]+1/15+1/21=1/3+1/6+1/3[1/2-1/5]+ 1/15+1/21=1/3+1/6+1/6-1/15+1/15+1/21=1/3+1/21=8/21 4、原式=1-/(7*8)-1/(8*9)-…-1/(12*13)=1-1/7+1/8-1/8+1/9-…+1/13=1-1/7+1/13=1-(1/7-1/13)=1-4/117=113/117 5、原式=1/2(1/13-1/15+1/15-1/17+….
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