x-0.8x=1.3的解方程-搜答案-智慧作业帮

方程x(x-3)=6-2x的解

x(x-3)=6-2xx²-3x=6-2xx²-x-6=0(x-3)(x+2)=0x1=3x2=-2

x(x^2-2)+2x^2(x+3)-3x(5x-7)=x(3x^2-9x+17)+2=>x^3-2x+2x^3+6x^2-15x^2+21x=3x^3-9x^2+17x+2=>2x=2x=1

【解法一】【解法二】5x(x+7)(x+4)=5x(x^2+11X)5x(x²+11x+28)-5x(x²+11x)=05x^3+55x^2+140x=5x^3+55x^25x(x

x-0.8x=10 解方程

x-0.8x=100.2x=10x=50

提出x得到：x*(1-1/2+1/2-1/3+1/3-1/4……+1/2008-1/2009)=2008接着：x*(1-1/2009)=2008最后：x=2009

4(123-x)=57+x492-4x=57+xx+4x=492-575x=435x=87

(140%x*0.8-50)-x=701.12x-50-x=701.12x-x=50+700.12x=120x=120÷0.12x=1000

解方程：X-0.8X=24.5

X-0.8X=24.5(1-0.8)x=24.50.2x=24.5x=24.5/0.2x=122.5

2x^2-5x-x^2-2x=x^2-6-7x=-6x=6/7

2x-(0.8x+40)+(1.2x-20)=9002x-0.8x-40+1.2x-20=9002x-0.8x+1.2x=900+40+202.4x=960x=400

0.8x+0.2x=1.8*2（0.8+0.2）x=3.6x=3.614*8-6x=64112-6x=64112-64=6x48=6x48/6=xx=8

1.3x/（3x-4）-1=x/63x/（3x-4）=(x+6)/618x=(3x-4）(x+6)3x^-x-24=0(x-3)(3x+8)=0x=3或x=-8/32.设一年期存款和三年期存款分别为x

x(x+3)-x(1-2x)=1+3x²x²+3x-x+2x²=1+3x²x²+3x-x+2x²-3x²=12x=1x=2分之1

你可以把上面的试子看成1x-0.8x=22,(1-0.8)x=22,0.2x=22,x=110

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5X-0.8*5X=255x×(1-0.8)=255x×0.2=25x=25

(x+x)+(x-x)+(xx)+(x/x)=1002x+0+x²+1=100x²+2x+1=100（x+1）²=10²x+1=10或x+1=-10x=9或x=

移项1.3x-0.9x=11.6-0.80.4x=10.8x=10.8÷0.4x=27

1.3x(x-1)=x(x+5);x(3(x-1)-(x+5))=0;x(2x-8)=0;x=0,x=42.2x^2-3=5x;2x^2-5x-3=0;(2x+1)(x-3)=0;x=-0.5,x=3