0.2 x-4-2.5=0.05 x-3

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0.2 x-4-2.5=0.05 x-3
4x-15=2.5x+15

4x-15=2.5x+151.5X=30X=20

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)

19.8x+0.2x=2.5×2

19.8x+0.2x=2.5×2⇒ (19.8+0.2)X=5⇒ 20X=5⇒ X=0.25

解方程3x=x+4,2.6x-8=2.4x,4x+12=10x+3 ,7x=12-×,2.5x=2x+4,5x+3=6x

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x+3/20x=46 ,x-1/5x=40 ,x-1/2x=3/4 ,x-0.2x=18解方程

x+3/20x=4623x/20=46x=46x20/23=40,x-1/5x=404x/5=40x=200/4=50,x-1/2x=3/4x/2=3/4x=3/2,x-0.2x=180.8x=18x

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=

4x-15=2.5x

4x-2.5x=151.5x=15x=15/1.5x=10

4-x=2(-0.5x²+2.5x-2)

解4-x=2(-0.5x²+2.5x-2)4-x=-x²+5x-4x²-6x+8=0(x-4)(x-2)=0∴x=4或x=2

解方程 3X+3.3=7.92 2.5×8-2X=12 1/2×(X+1)=3/4 3/4X-0.05X=17.5

(1)3x+3.3=7.923x=7.92-3.33x=4.62x=1.54(2)2.5*8-2x=122x=20-122x=8x=4(3)1/2(x+1)=3/4x+1=3/2x=1/2(4)3/4

0.4x+3.2=2.5x+0.05 X是多少

0.4x-2.5x=0.05-3.22.1x=3.15x=1.5

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

8x-4x=0.64 0.2x-x=416 7x+2.5x=3.8 (3.8-2)x=14.4

8x-4x=0.644x=0.64x=0.64÷4x=0.160.2x-x=416-0.8x=416x=416÷(-0.8)x=-5207x+2.5x=3.89.5x=3.8x=3.8÷9.5x=0.

9^x+4^x=2.5*6^x

两边同时除以6^x,则(4/6)^x+(6/6)^x>(9/6)^x(2/3)^x+1>(3/2)^x,令(2/3)^x=y且y>0y+1>1/yy^2+y-1>0因为y>0,解得y>[5^(1/2)

3.5X+2.5(14-X)=4

3.5X+2.5(14-X)=43.5x+35-2.5x=43.5x-2.5x=4-35x=-31

求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13

1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1=(1/2x^2-0.5x^2)+(0.25x-1/4x)+(0.2x^3-1/5x^3)+0.5x-1=0.

3(x-7)-5(4-x)=15 0.2分之0.1x+0.3+2.5=0.4x-1

解方程?3(x-7)-5(4-x)=153x-21-20+5x=153x+5x=15+20+218x=56x=70.2分之0.1x+0.3+2.5=0.5分之0.4x-1(0.1x+0.3)/0.2+

方程:10.5{x-4}=2.5x

10.5(X-4)=2.5X10.5X-42=2.5X10.5X-2.5X=428X=42X=42÷8X=5.25

10.5(x-4)=2.5x

10.5x-2.5x=10.5*48x=42x=5.2

x-4/0.2-2.5=x-3/0.05

5(x-4)-5/2=20(x-3)第一个分子分母同时乘以5,第二个小数化分数,第三个乘以205x-20-5/2=20x-60-15x=-37.5∴x=2.5

(1)3x(x+0.2)=4x(x-1.1)

(1)3x(x+0.2)=4x(x-1.1)3x+0.6=4x-4.44x-3x=0.6+4.4x=5(2)乘以0.8得4(1-x)=3x4-4x=3x4=7xx=4/7(7分之4)(3)1.1x1.