百度作业网0.2 x-4-2.5=0.05 x-3
来源：学生作业帮助网 编辑：作业帮 时间：2024/06/25 16:37:27
4x-15=2.5x+151.5X=30X=20
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⇒ (19.8+0.2)X=5⇒ 20X=5⇒ X=0.25
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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
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-2.5x=151.5x=15x=15/1.5x=10
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
（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-2.5x=0.05-3.22.1x=3.15x=1.5
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=0.644x=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.
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)=43.5x+35-2.5x=43.5x-2.5x=4-35x=-31
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.
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+
10.5（X－4）＝2.5X10.5X－42＝2.5X10.5X－2.5X＝428X＝42X＝42÷8X＝5.25
10.5x-2.5x=10.5*48x=42x=5.2
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)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.