0.4x = 6÷0.9
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8x-0.4×6=0解8x-2.4=08x=2.4x=0.30.5【x-3】=31.5解0.5x-1.5=31.50.5x=33x=66x+5.6=3x解3x=x+5.63x-x=5.62x=5.6x
(1)(x+6)/(x^2+2x+1)-(x+4)/(x^2+x)=0(x+6)/(x+1)²-(x+4)/[x(x+1)]=0都乘以x(x+1)²得,x(x+6)-(x+4)(x
(x+1)(x²-x+1)+6x³÷(-2x²)+(-x^6)÷x^4,=x³+1-3x-x^2,=x^3-x^2-3x+1=-8-4+6+1=-5
1、y=[(x+3)²/(x+3)(x-3)]×[x(x-3)/(x+3)]-x+3=[(x+3)/(x-3)]×[x(x-3)/(x+3)]-x+3=x-x+3=3∴无论x取何值,y的值均
2.7x+3=97.52.7x=97.5-3x=94.5÷2.7x=350.95÷0.4x=1.90.4x=0.95÷1.9x=0.5÷0.4x=1.256.8+x=24.5x=24.5-6.8x=1
注意:本题x=2时题目没意义,应该舍去(这是很多学生错误所在)这里x只能取根号2-1
(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
原式=2x(x-2)/(x+2)×x(x+2)/(x-2)²×3(x-2)/x=6x当x=√3/2时原式=3√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=
分子分母可以化简的,十字相乘法学过吗?
(1)2x+0.82﹦8.2 2x+0.82-0.82﹦8.2-0.82  
2x-6/4-4x+x^2÷x-3/x-2=-2x-7/2+x-3/x=-x-3/x-7/2=1+3-7/21/2
1/(x+1)-[(3-x)/(x^2-6x+9)]÷[(x^2+x)/(x-3)]=1/(x+1)+[(x-3)/(x-3)^2][(x-3)/(x^2+x)]=1/(x+1)+1/(x^2+x)=
3÷(9x-60-2x)=0.33÷0.3=9x-60-2x10=9x-60-2x10+60=9x-2x70=7xx=106x-3.2=4x6x-4x=3.22x=3.2x=1.60.6x+5+0.4
原式=2(x-3)/(x-2)²×1/(x+3)×(x-2)(x+3)/[-(x-3)]=-2/(x-2)当x=-1/2时原式=-2/(-5/2)=4/5
①13X-6.8X+X=46.8, x(13-6.8+1)=46.8,
x÷2+x÷5+x÷6=1066可以写作x/2+x/5+x/6=1066则方程两边同时乘以30得,15x+6x+5x=31980,26x=31980,x=1230再问:不明白再问:为什么两边同时乘以3
x²-3x=2x+14x²-5x=14∴﹙4x³-6x²+2x﹚/2x-﹙x+1﹚²+1=2x²-3x+1-x²-2x-1+1=x
x-0.4x=360.6x=36x=36÷0.6x=602y-66=282y=66+28=94y=94÷2y=478x-6x=1402x=140x=140÷2x=7012x÷4=723x=72x=72