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2/3x1/4=1/2x+3/8解方程或比例

2/3x1/4=1/2x+3/82/3x-1/2x=3/8+1/41/6x=5/8x=15/4

2x-3/4=1/8 解:2x=1/8+6/82x=7/8 x=7/8÷2 x=7/16

2X-3/4=1/42X=3/4+1/42X=1 X=1/2

①x2-4x-8=0,配方得:(x-2)2-12=0,∴(x-2)2=12,解得:x1=2+2 3 ,x2=2?2 3 ;②(3x-1)2=4(2x+3)2,化简得:7x2+54x+35=0,∴(x+7)(7x+5)=0,解得:x1=-7,x2=?5 7 ;③4x2-4x+1=x2+6x+9,移项化简得:3x2-10x-8=0,∴(x-4)(3x+2)=0,解得:x1=4,x2=-2 3 ,④7x(x+5)+10=9x-9,去括号、移项、化简得:7x2+26x+19=0,∴(x+1)(7x+19)=0,解得:x1=-1,x2=?19 7 .

4X+2X-6=2X-46X-2X=24X=2X=0.5 如有帮助请采纳. 把1/2代入4X+2X-6=2X-4 等于-3=1-4 x/2+(x-3)/4=(2x-4)/8的两边同时X8 得到4X+2X-6=2X-4

两边乘43x-2=2x+8/3移项3x-2x=8/3+2x=14/3

X+2/4=X/2 2(x+2)=4x2x+4=4x2x=4x=20.75:(X+3)=2:8 2(x+3)=8*0.752x+6=6x=0

2/3-8X=3-(1/2)X 2/3-3=-1/2x+8x-7/3=(15/2)xx=-14/451/6(3X-6)=2/5X-3x/2-1=(2/5)x-3x/2-(2/5)x=-3+1x/10=-2x=-204X-3(20-X)=-44x-60+3x=-47x=56x=81/3(1-2X)=2/7(3X+1)1/3-(2/3)x=(6/7)x+2/71/3-2/7=(6/7)x+(2/3)x1/21=(32/21)xx=1/322.5405/(1+2.7%)^3=约4989.8(1+2.7%)^3为(1+2.7%)的三次方

(2x+3)^2-3(2x+3)=4 解:(2x+3)^2-3(2x+30-4=0 (2x+3-4)(2x+3+1)=0(2x-1)(2x+4)=0 x1=1/2 x2=-2 所以原方程的解是:x1=1/2 x2=-2

①4x+3*0.7=6.5, 4x+2.1-2.1=6.5-2.1,4x=4.4, 4x÷4=4.4÷4, x=1.1;②x:8= 3 4 :1 1 5 , 1 1 5 x=8* 3 4 ,1 1 5 x÷1 1 5 =6 ÷1 1 5 , x=5;③2x+2*0.7=4.5,2x+1.4-1.4=4.5-1.4, 2x=3.1,2x÷2=3.1÷2, x=1.55;④x:8= 1 4 : 1 5 , 1 5 x=8* 1 4 , 1 5 x ÷ 1 5 =2÷ 1 5 , x=10.

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