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x十0,2x一0,9=9,6怎么解方程

x+0.2x-0.9=9.6 1.2x=9.6+0.9 1.2x=10.5 x=8.75

2x+6x-60=260 8x=320 x=40

(1)去括号得:3x+18=9-5+10x移项得:3x-10x=9-5-18合并同类项得:-7x=-14则x=2;(2)去分母得:2x+1=x+3-5移项,合并同类项得:x=-3;(3)去分母得:10y+2(y+2)=20-5(y-1)去括号得:10y+2y+4=20-5y+5移项,合并同类项得:17y=21系数化为...

(1)196x2-1=0,整理,得(14x+1)(14x-1)=0,令14x+1=0或14x-1=0,解,得x1=-114,x2=114.(2)4x2+12x+9=81整理,得x2+3x-18=0,即:(x+6)(x-3)=0令x+6=0或x-3=0,解,得x1=-6,x2=3.(3)x2-7x-1=0即:x=7±72+42=7±532,∴x1=7+532,...

(1)开方得:2x-3=3(2x+3)或2x-3=-3(2x+3),解得:x1=-3,x2=-34;(2)分解因式得:(2x-6)(x-1)=0,可得2x-6=0或x-1=0,解得:x1=3,x2=1;(3)方程变形得:(5x-1)2-3(5x-1)=0,分解因式得:(5x-1)(5x-1-3)=0,解得:x1=0.2...

(1)移项,得6x-12x=10+9,合并,得-6x=19,化系数为1,得x=-196;(2)去括号,得2x-4=6x-3,移项,得2x-6x=4-3,合并、化系数为1,得x=-14;(3)去分母,得3(x-1)-12=2(2x+1),去括号,得3x-3-12=4x+2,移项,得3x-4x=3+12+2,化系数为1...

1)1.5x+3x=6 4.5x=6 x=6/4.5 =4/3 2)2x-1.5x=1.9 0.5x=1.9 x=1.9/0.5 =3.8 3)0.54 x-4.5*6=45 0.54x-27=45 0.54x=45+27=72 x=72/0.54 =400/3 4)7x-0.4=0.3 7x=0.3+0.4=0.7 x=0.7/7 =0.1 5)8x+5x=65 13x=65 x=65/13 =5 6)0.9x-3*1.2=7.2...

解答:(1)解:(x-6)(x+1)=0,x-6=0或x+1=0,∴原方程的解是x1=6,x2=-1.(2)解:(x-11)(x+9)=0,x-11=0或x+9=0,∴原方程的解是x1=11,x2=-9.(3)解:(x-3)2-4(x-3)=0,(x-7)(x-3)=0,x-3=0或x-7=0,∴原方程的解是x1=3,x2=...

将2x=y代入x-y-9+3a=0,得 x-2x-9+3a=0 => x=3a-9 根据题目,则y=6a-18 将x=3a-9, y=6a-18代入x+y-6=0,得 (3a-9)+(6a-18)-6=0 => 9a-33=0 => a=11/3 当a=11/3时,方程组的解为2x=y

(1)因式分解得,(2x+1)(x+3)=0,解得,x1=12,x2=3;(2)移项得,(x-1)2+2(x-1)=0,提公因式得,(x-1)(x-1+2)=0,解得,x1=1,x2=-1;(3)移项得,x(2x+3)-(4x+6)=0,提公因式得,(2x+3)(x-2)=0,解得,x1=-32;x2=2;...

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