搜搜考试网(11x91 X)÷12=X - 5.5 的过程
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/06 01:47:29
这是两道题吗?1、两边同时乘(x-1)(x-2)(x-3）答案是x1=-1,x2=22、分母因式分解分别为(x-7)(2x+3)和(x-5)(x-7)然后同时乘(x-5)(x-7)(2x+3)答案是x
x/(2x^2-11x-21)=(x+7)/(x^2-12x+35)x/(2x+3)(x-7)=(x+7)/(x-5)(x-7)x/(2x+3)=(x+7)/(x-5)x(x-5)=(x+7)(2x+
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550120x=550x=55/12=4.583
【解法一】【解法二】5x(x+7)(x+4)=5x(x^2+11X)5x(x²+11x+28)-5x(x²+11x)=05x^3+55x^2+140x=5x^3+55x^25x(x
5x/(x²+x-6)+(2x-5)/(x²-x-12)=(7x-10)/(x²-6x+8)5x/(x-2)(x+3)+(2x-5)/(x+3)(x-4)=(7x-10)
6x^3+7x^2-13x+11＝6x^3+3x^2-15x+4x^2+2x-10+21＝3x（2x*x+x-5）+2（2x*x+x-5）+21＝3x*0+2*0+21＝21
(5-2x)/(x^2-x-12)=5x/(x^2+x-6)+(10-7x)/(x^2-6x+8)(5-2x)/(x-4)(x+3)=5x/(x+3)(x-2)+(10-7x)/(x-2)(x-4)分
5x(x+7)(x+4)=5x(x^2+11X)5x^3+55x^2+140x=5x^3+55x^2140x=0x=0
5x=15（12-x）,20x=180,x=9
11/2÷0.4=1.35÷x；11/2x=1.35×0.45.5x=0.54x=27/27512+3（x-1）=18；12+3x-3=183x=9x=35x+1=3+3（1-x）；5x+1=3+3-
x(2x-3)+3x+3x(x-2)=5x(x-4)+112x²-3x+3x+3x²-6x=5x²-20x+115x²-6x=5x²-20x+115x
再问：最后是分数吗
前面那些看不懂.-1.5x=18*2-1.5x=36x=-24再问：x=4x=2545x-x=1803x+x=1615x-11x=12.8(12+12*1.5)x=3603.5(85=X)=560(x
原式化简：{（x-3)(x-2)/(x-3)(x-4)}²÷{(x+1)(x+2)/(x-4)(x+2)}²{(x-2)/(x-4)}²÷{(x+1)/(x-4)}
4.316.73.572.5245.2再问：过程、再答：x+5.7=10移项x=10-5.7=4.3x-6.2=10.5移项x=10.5+6.2=16.73x=10.5x=10.5/3=3.5x÷7=
9x-12x+5x=-3x+5x=2x3x-5x-2+5x+8=-2x+5x-2+8=3x+63x+5+2x+3-7-11x=3x+2x-11x+5+3-7=5x-11x+8-7=-6x+1
11x+0.5=15x-0.74x=1.2x=0.35x+12=8x+33x=9x=35x+14=7x-42x=18x=9
=x^2+10x-24+x^2+15x+56-x^2+5x+50=x^2+30x+82=4+60+82=146其实,不化简,直接代入=14*0+9*10+7*8=0+90+56=146也很简单
第一题：x-x/5=2.45x-x=124x=12x=3第二题：12/5%x=8240x=8x=1/30第三题：4x+x=12.55x=12.5x=2.5