1.2x-0.6*4=2.64

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1.2x-0.6*4=2.64
解方程(1)x-2x=1-2/3x (2)x-3x-1.2=4.8-5x (3)-x=1-2x (4)2x-x+3=1.

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=13.2 1.5X-X=6 4X+1.2X=26

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

x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x

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)

公式法解方程1.2x²-4x=12.x²-3x=03.1/4x²-x+1=04.2x&su

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

已知8x-2.5*0.8x=24,那么0.38x+1.2x=( );已知6x+4x=8,那么70x-( )=29.5

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+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?

x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊

2x+3x+4x+5x+x+6x+7x=100

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

解方程:1.2x/2x-1+x/x-2=2 2.1/2x+3+1/3-2x=4x/4x²-9

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=4.6 x-2.08=5.76 1.2x=0.84 3x+0.5x=4.2 4x-2.16=1.2 x-0.

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÷

解下列方程:1.2x+1.1*2=8.2 x/10-6=12.5 5x+x-4x=106 x-0.85x+36=42

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

解方程:x/4=30% 36/x=3/4 10/x=2.5/0.8 x/4=1.2/5 X/1.2=1.5/0.6 x/

x/4=30%x=4*30%=120%36/x=3/43x=36*4x=36*4/3=4810/x=2.5/0.82.5x=10*0.8x=10*0.8/2.5=3.2x/4=1.2/55x=4*1.

方程 0.6(x+4)+0.8=1.2x+0.58 11x+42-2x=100-9x-22

再答:再问:第一道题是什么,能打字打出来吗?再答:

解方程:(1)x-0.75x=12(2)2.8x+x=7.6(3)2.36x+2.64x=18(4)3.5x-1.5x=

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

已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值

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=

13x-5x(2x-3.3)=24 16-5x(x+1.2)=2x-4 方程解

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.

1.2(x-2)-3(4x-1)=9(1-x) 2.11x+64-2x=100-9x 3.15-(8-5x)=7x+(4

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=4.2 4x-2.16=1.2 x-0.2x=16 2x-4x[这个x是乘】2.5=3.6 3x+5x=

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

公式法解方程1.2x²-4x-1=02.5x+2=3x²3.(x-2)(3x-5)=14.x&sup

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

方程X+0.6X=15.6 4(18-x)=32.8 9x=30+6x

X+0.6X=15.61.6x=15.6x=9.754(18-x)=32.818-x=8.2x=18-8.2x=9.89x=30+6x3x=30x=10再问:偶才5年级。。。有的不能省略。。。。被搞糊

先化简,再求值:(x-2/x-x+2/x)/x-2/4x,x=2011

能不能先用()把每个分数括起来?