3.3x-1.2*4=11.7

1)-x=1-2/3x-1/3x=1x=-32)-2x-1.2=4.8-5x3x=6x=23)x=14)x+3=1.5-2x3x=-1.5x=-0.5

3x-18=13.23x=13.2+18x=10.41.5x-x=60.5x=6x=6/0.5=124x+1.2x=265.2x=26x=5

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)

1.2x²-4x=1x²-2x-1/2=0x²-2x+1-1-1/2=0（x-1）²=3/2x-1=±√6/2x1=1+√6/2x2=1-√6/22.x&sup

6x=24x=41.58*4=6.3210x=8x=0.870*0.8-29.5=26.5再问：确定答案吗？直接采纳喽

x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊

2x+3x+4x+5x+x+6x+7x=10028x=100x=100/28x=25/7

1.2x/2x-1+x/x-2=22x(x-2)+x(2x-1)=2(2x-1)(x-2)2x²-4x+2x²-x=4x²-10x+45x=4x=4/5检验：x=4/5是

3.2+x=4.6x=4.6-3.2x=1.4x-2.08=5.76x=5.76+2.08x=7.841.2x=0.84x=0.84÷1.2x=0.73x+0.5x=4.23.5x=4.2x=4.2÷

1.2x+1.1*2=8.21.2x=8.2-1.1*21.2x=6x=5x/10-6=12.5x/10=12.5+6x/10=18.5x=1855x+x-4x=106（5+1-4）x=1062x=1

1.3x+1.2=4.53x=3.3x=1.12.1/2:1/3=1/4:x1/2x=1/3×1/41/2x=1/12x=1/63.3/4x-2=1.63/4x=3.6x=4.84.(0.4+x)×6

再答：再问：第一道题是什么，能打字打出来吗？再答：

即x²-5x=-1所以原式=x³-5x²+x²-5x+x-1=x(x²-5x)+(x²-5x)+x-1=-x-1+x-1=-2

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=

是5x乘(2x-3.3),还是5乘(2x-3.3),是5x乘(x+1.2),还是5乘(x+1.2)13x-5(2x-3.3)=2413x-10x+16.5=243x=24-16.53x=7.5x=2.

1、2x-4–12x+3=9-9x-10x-1=9-9xx=-102、9x+64=100-9x18x=36x=23、15-8+5x=7x+4-3x7+5x=4x+4x=-34、3x-21-2(9-8+

3x+0.5x=4.23.5x=4.2x=4.2÷3.5x=1.24x-2.16=1.24x=3.36x=0.84x-0.2x=160.8x=16x=202x-4x乘以2.5=3.62x-10=3.6

3（x-12)=3.3x-12=3.3/3x-12=1.1x=12+1.1x=13.12.5-x=7.5/52.5-x=1.5x=2.5-1.5x=15/x+1.5=45/x=4-1.5x=5/2.5

1.2x²-4x-1=0x²-2x-1/2=0x²-2x+1-1-1/2=0（x-1）²-3/2=0x-1=±√（3/2）x1=1+√6/2x2=1-√6/22

能不能先用（）把每个分数括起来?