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【x+(1/2x+1)】÷2+20=x 怎么解

(2x-2)+x+(x/2+1)=20 2x-2+x+x/2+1=20 3x+x/2=21 (3+1/2)x=21 x=6

 x+x+20=1.2x+x 2x+20=2.2x 0.2x=20 x=100

(x一20)÷3=(x一45)÷2 2(x一20)=3(x一45) 2x-40=3x-135 3x-2x=135-40 x=95

2[x/3-(2X/3-1/20)]=3(X+1)/4 解方程:2(X/3-2X/3+1/20)=3/4(x+1) 2(1/20-x/3)=3x/4+3/4 1/10-2x/3=3x/4+3/4 -2x/3-3x/4=3/4-1/10 - 17x/12=13/20 x=13/20÷(-17/12) x=-13/20x12/17 x=-39/85

4(2x-1)-2(x+1)=24 8x-4-2x-2=24 6x=24+4+2=30 x=30÷6 x=5 x÷2=(3x-10)÷5 两边乘10 5x=2(3x-10) 5x=6x-20 6x-5x=20 x=20

y = (x-1)|x2-3x+2| = (x-1)|(x-1)(x-2)| x<1时,或x>2时: y=(x-1)(x-1)(x+2)=(x-1)2(x-2) y′=2(x-1)(x+2)+(x-1)2=(x-1)(3x-5) 1≤x≤2时: y = - (x-1)2(x-2) y′ = -(x-1)(3x-5) x趋近2-时,y′趋近-(2-1)(6-5)=-1 x趋近2+时,y′趋近(2-1)(6-5)...

(x一20)十(2x)十(x一10)十(X÷2)=235 4x-30+x/2=235 4x+x/2=265 8x+x=530 9x=530 x=530/9

(1)去括号得:8x+12=8-8x-5x+10,移项,合并同类项得:21x=6,系数化1得:x=27;(2)整理可得:10x?103-10x+205=1.2去分母得:50x-50-30x-60=18,解得:x=6.4.

1/2x+2/5x=18 0.5x+0.4x=18 0.9x=18 x=18÷0.9=20

原解很对呀 lim【(2x-3)^20 * (3x+2)^30]/(2x+1)^50 】=lim(2-3/x)^20*lim(3+2/x)^30 / lim(2+1/x)^50 =【lim(2-3/x)】^20* 【lim(3+2/x)】^30 / 【lim(2+1/x)】^50 =2^20 * 3^30 / 2^50 =3^30/2^30 =(2/3)^30

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