84*2X=0.4

是这样的：x^5+x^4=x^3(x^2+x)=(x^2+x)[(x^3-1)+1]=(x^2+x)(x^3-1)+x^2+x=[x(x+1)(x-1)](x^2+x+1)+x^2+x=(x^3-x)

x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊

梨树x+3x=2404x=240x=60桃树为60*3=180棵解设还需要租辆x小客车32*3+5*x=1205*x=24x=4.8就是要5辆小汽车解设小聪今年x岁9*x-7.5*x=61.5*x=6

1.4x-2=3-xx=12.-7x+2=2x-4x=三分之二3.-x=-0.4x+1x=-三分之五4.11x+1=5(2x+1)x=45.4x-3(20-x)=3x=96.5(x+8)-5=0x=-

(1)1+0.4x=0.2(x+10)（2）x÷2=x+2001+0.4x=0.2x+2-200=x/20.2x=1-400=xx=5x=-400

2-x+5/6=x-x-1/3两边乘612-x-5=6x-2x+27-x=4x+25x=5x=10.1-0.2x/0.03-1=0.7-x/0.4两边乘1.240-80x-1.2=5.1-3x77x=

48(2x+1)(x^2+x+3)^47(x^3+5x-2)^84+84(3x^2+5)(x^2+x+3)^48(x^3+5x-2)^83应该就这个了,

x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)x/(x-2)=2x/(x-3)+(1-x)/(x-2)(x-3)x(x-3)/(x-2)(x-3)=2x(x-2)/(x-2)(x-3)

6x-2（340-3x）=2206x-680+6x=2206x+6x=680+22012x=900x=7518+0.4x=22.2-x0.4x+x=22.2-181.4x=4.2x=3

设x1=4-√3,x2=4+√3,是方程X^2-8X+13=0的两根所以X1^2-8X1+15=2X^4-6X^3-2X^2+18X+23=(X+1)^2*(X^2-8X+13)+10=10所以原式=

1、0.3X-0.4X=0.5-0.1X=0.5X=52、5X-2.5X+3.5X=-186X=-18X=-33、X-2/5X=-3+63/5X=3X=5

28X=84X=30.8X=60X=751.6X=8X=53X=24X=80.5X=1X=2再问：要过程啊我这是作业汗快点把我很急谢谢你啊再答：30X-2X=8428X=8428X÷28=84÷28X

x/x(x-1)+2=2x/(x+1)1/(x-1)+2=2x/(x+1)x+1+2(x-1)(x+1)=2x(x-1)x+1+2x²-2-2x²-2x=0-x-1=0-x=1x=

x+3x=1484x=148x=3715x-8x=5.67x=5.6x=0.86x-x=965x=96x=96/5x=19又1/52除以x=0.50.5x=2（两边同时×10）5x=20x=43x+3

0.88x+0.88*20%x=x+841.056x=x+84x=1500

再问：3(x-1)-2(1.5x-)=4(x-1)再问：1等于负二分之X-1加六分之x-2减三分之x+2

=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

能不能先用（）把每个分数括起来?

2x+0.4x=48(2+0.4)x=48x=48/2.4x=20(并检验)2×20+0.4×20=40+8=488x-x=14.7(8-1)x=14.7x=14.7/7x=2.135x+13x=9.

x-(2x/3-2)-{0.4[x-(2x/3-2)]+3}=6(x-2x/3+2)-0.4(x-2x/3-2)-3=6(1-0.4)(x-2x/3-2)=6+30.6(x/3-2)=9x/3-2=9