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2.25:6=(x-2.25):2怎么做?

开方得 (x-2)(x-6)=5 或 (x-2)(x-6)=-5 x^2-8x+12=5 或x^2-8x+12=-5 x^2-8x+7=0 或x^2-8x+17=0 x^2-8x+7=0 即(x-1)(x-7)=0 x=1 或x=7 x^2-8x+17=0 x^2-8x+16=-1 (x-4)^2=-1 无解 所以x=1 或x=7

(1)(x+2.6):70%=2÷25% x+2.6=2÷25%×70% x+2.6=5.6 x+2.6-2.6=5.6-2.6 x=3;(2)1-13x=1315 1315+13x=11315+13x-1315=1-1315 13x=215 13x×3=215×3 x=25;(3)4÷(x-12)=12 12(x-12)=4 12(x-12)×2=4×2 x-12=8 x-12+12=8+12 x=812.

左==(6x^4 - 24x^3 + 24x^2) - x^3 - 12x^2 + 25x + 6 =6x^2*(x - 2)^2 - x^3 + 4x^2 - 4x - 16x^2 + 29x + 6 =6x^2*(x - 2)^2 - x(x^2 - 4x + 4) - (16x^2 - 29x - 6) =6x^2*(x - 2)^2 - x(x - 2)^2 - (x - 2)(16x + 3) =(x - 2)[6x^2*(x - 2) ...

1)x^2=25 X=5或-52)x^2-81=0 x^2=81 x=9或-93)(25x)^2=36 25x=6或-6 x=6/25或-6/25

①(3x-1)^2=25 3x-1=±5 3x=1±5 x1=2 x2=-4/3 ②(x-2)(x+3)=-6 x²+x-6=-6 x²+x=0 x(x+1)=0 x1=0 x2=-1

由圆(x+2)2+(y-2)2=25,得到圆心A坐标为(-2,2),半径r=5,∵P(1,6)到圆心A的距离d=(1+2)2+(6?2)2=5=r,∴P在圆上,又直线PA的斜率为6?21+2=43,∴过P切线方程的斜率为-34,则过P切线方程为y-6=-34(x-1),即3x+4y-27=0.过点P(1,6)与...

1.25:x=2.25:0.25 1.25:x=9:1 9x=1.25 x=1.25/9 x=125/900 x=5/36

①(x-2) 2 =25,开方得:x-2=5或x-2=-5,解得:x 1 =7,x 2 =-3;②2x 2 -3x-4=0,这里a=2,b=-3,c=-4,∵△=9+32=41,∴x= 3± 41 4 ,则x 1 = 3+ 41 4 ,x 2 = 3- 41 4 ;③x 2 -( 2 + 3 )x+ 6 =0,分解因式得:(x- 2 )(x- 3 )=0,解得:x ...

不能简算,最前面的和乘号前面的小括号是中括号吧,如果是,这么做: [(90.75÷6.6+2.25)-10]x1.06 =[(13.75+2.25)-10]x1.06 =[16-10]x1.06 =6x1.06 =6.36

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