2.8x-3.2*4=1.2

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

x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊

9X-3.2X=8.125.8X=8.12X=8.12÷5.8X=1.415分之4：X=1.36:171.36X=17×4/151.36X=68/15X=68/15÷1.36X=10/3

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

1.4X-0.5X=1.753.5X=1.75X=0.52.X除0.63=12X=12*0.63X=7.563.6X=20X=3分之104.2X=3.2X=1.6

4X=49-21X=28÷4X=72/3X=8÷3/5X=8×5/3×3/2X=204.5X=54X=54÷4.5X=120.5X=3.7-16X=-12.3÷0.5X=-24.62.4X=3.2+2

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.x/x+1-1=3/（x+1)(x-2)两边乘以(x+1)(x-2)得x(x-2)-(x+1)(x-2)=3x²-2x-x²+x+2=3-x=1x=-1检验：x=-1是增根2.

1.x/0.5-10+2=0x/0.5=8x=42.4(0.9-x)=3.2x3.6-4x=3.2x3.6=7.2xx=0.53.6.4-2(x+1.2)=0.46.4-2x-2.4=0.42x=3.

解(1)x-0.75x=120.25x=121/4x=12x=12×4x=48(2)2.8x+x=7.63.8x=7.6x=7.6÷3.8x=2(3)2.36x+2.64x=185x=18x=18÷5

4x-x=24x(4-1)=243x=24两边同除以3得：x=81.5x-x=1x(1.5-1)=10.5x=1两边同乘以2得：x=23.2x-1=63移项得：3.2x=63+13.2x=64x=64

1、0.5x+30=15.5x30=(15.5-0.5)x30=15xx=22、3.2x-12.6=1.2x(3.2-1.2)x=12.62x=12.6x=6.3

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=

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+

望采纳哟!再问：我是五年级小学生，能简便点吗，谢谢再答：不好意思，才看到您的回复哟如果您是五年级学生，那我就想问您那个0.5后面是乘号还是未知数x啊?如果是乘号那过程应该是0.5（x+4）-0.4(x

解8.4x-2.8x+6=80.8-1.2x8.4x-2.8x+1.2x=80.8-66.8x=74.8∴x=748/68=11∴x=11

2x+3.6*2=12.4x=13(x+3.6)=18.6x=2.6x+3.5x=13.5x=327x-4x=34.5x=1.5……不能这么懒,自己做一做,实在是很简单.你自己做比抄我们的答案还快.