20分之17加14.9的和在乘负7分子1减1又7分之3在除56分子11
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![20分之17加14.9的和在乘负7分子1减1又7分之3在除56分子11](/uploads/image/f/240125-5-5.jpg?t=20%E5%88%86%E4%B9%8B17%E5%8A%A014.9%E7%9A%84%E5%92%8C%E5%9C%A8%E4%B9%98%E8%B4%9F7%E5%88%86%E5%AD%901%E5%87%8F1%E5%8F%887%E5%88%86%E4%B9%8B3%E5%9C%A8%E9%99%A456%E5%88%86%E5%AD%9011)
(24/29+16/17)×1/8+15/17=24/29×1/8+16/17×1/8+15/17=3/29+(2/17+15/17)=3/29+1=32/29
(11+20+37)x1/17+(19+38)x1/19再答:答案=4+3=7
解题思路:分数的简便计算问题,注意分数的结构问题可以进行变换解题过程:
(1/17+1/19)*20=2+(3/17+1/19)-----a(1/24+1/29)*30=2+(6/24+1/29)-----b(1/31+1/37)*40=2+(9/31+3/37)----
1/ab+1/ac=1/3-1/12=1/41/ab+1/c=1/31/c-1/ac=1/12(a-1)/ac=1/12a=2c=6b=3
1/ab+1/ac=1/3-1/12=1/41/ab+1/c=1/31/c-1/ac=1/12(a-1)/ac=1/12a=2c=6b=3
(5/12+1/19)×12+7/19=5/12×12+1/19×12+7/19=5+(12/19+7/19)=5+1=6
15分之1加17分之2的和乘15乘17=17+2*15=47
(5/6+15%)*24=5/6*24+15%*24=20+360%=23.6
51分之2加18分之5的和乘9乘17(2/51+5/18)×9×17=2/51×9×17+5/18×9×17=6+42.5=48.5
(7/12+1/3)*3/7=1/4+1/7=11/28
(7/13+8/13)×13/8×17/8=15/13×13/8×17/8=15/8×17/8
894乘124减627分之267+123乘897除2008乘0.5分之2007乘(0.4加2008分之0.8)=894乘124减627分之267+123乘897除2008乘0.5分之2007乘502分
1/(1x4)+1/(4x7)+1/(7x10)+...+1/(2005x2008)=1/3*(1/1-1/4)+1/3*(1/4-1/7)+1/3*(1/7-1/10)+...+1/3*(1/200
1/2*(1/19-1/99)=40/1881
看到你问过一个类似的题目,三个连续自然数相乘的倒数,此题类似,考虑通式:(2n+3)/[n(n+1)(n+2)(n+3)]=(n+n+3)/[n(n+1)(n+2)(n+3)]=1/[(n+1)(n+
解题思路:根据题意,列出算式,在计算时应考虑用乘法分配律比较简便。解题过程:(1/4+2/9)×3.6=1/4×3.6+2/9×3.6=0.9+0.8=1.7
1/1*2+1/2*3+.+1/199*200=1-1/2+1/2-1/3+.+1/199-1/200=1-1/200=199/200
(8/17+8/13)*13/8*17/8=8/17*13/8*17/8+8/13*13/8*17/8=30/8=15/4
(2/69+2/71)*23+25/71=2*(69+71)/(69*71)*23+25/71=2*140/(69*71)*23+25/71=280/(3*71)+25/71=(280+25*3)/(