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先化简再求值括号x-1括号除以2除以x加1减一括回来...

X^2=(x一l)^2+25 0=-2x+1+25 2x=26 X=13

x-1的算术平分根+括号y+2收括号=0 解得x=1,y=一2。

解:已知a=2-√3, 得[(a-2)分之1+(a+2)分之1]÷(a+2)分之2a =[(a-2)分之1+(a+2)分之1]×2a分之(a+2) =(a-2)分之1×2a分之(a+2)+(a+2)分之1×2a分之(a+2) =2a(a-2)分之(a+2)+2a分之1 =2a(a-2)分之(a+2)+2a(a-2)分之(a...

[3/(x+1)-(x+1)]÷(x²-4x+4)/(x+1) =(3-3x-3)/(x+1)²×(x+1)/(x-2)² =(-3x)(x-2)²/(x+1) =-3x(x-2)²/(x+1)

(x-1)(x-2)=0 两根分别为x₁=2,x₂=1 ∴2x₁-0x₂=4

4x^2乘上括号x^2减二分之1x加一括回 =4x²·x²-4x²·2分之1x+4x²·1 =4x^4-2x³+4x²

y=(根号下x+1)(根号下1/x-1) y'=(根号下x+1)'(根号下1/x-1)+(根号下x+1)(根号下1/x-1)' =1/2 (根号下1/x-1)/根号x-1/2 (根号下x+1)/根号x^3 =1/2(1/x-1/根号x)-1/2 (1/x+1/根号x^3) =-1/2(1/根号x+1/根号x^3) =-1/x^2*(x根号x...

(2x+1)(2x-1)+3×[(x+2)(x-)-]

1/3×(x+1)=1/7×(2x-3) 7(x+1)=3(2x-3) 7x+7=6x-9 7x-6x=-9-7 x=-16

2016-08-25 五分之6×括号负1/3-2分之一括号除以四分之五 2016-10-21 负24加负二分之三减48乘以括号五减六分之一加四分 2017-01-10 42×括号负三...

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