x为何值时,代数式(2x+9)\/(x+3)-(1\/x-3)-(2\/x)的值等于2? 用分式方程...
(2x+9)\/(x+3)-1\/(x-3)-(2\/x)=2x(2x+9)(x-3)-x(x+3)-2(x+3)(x-3)=2x(x+3)(x-3)2x³+3x²-27x-x²-3x-2x²+18=2x³-18x12x=18x=1.5因此,当x=1.5时,原式的值为2
x为何值时,代数式(2x+9)\/(x+3)-(1\/x-3)-(2\/x)的值等于2?
(2x+9)\/(x+3)-(1\/x-3)-(2\/x)=2 (2x+9)\/(x+3)-1\/x+3-2\/x=2 (2x+9)\/(x+3)-1\/x-2\/x=2-3 (2x+9)\/(x+3)-3\/x=-1 x(2x+9)-3(x+3)=-x(x+3)2x²+9x-3x-9=-x²-3x 2x²+x²+9x-3x+3x-9=0 3x²+9x-9...
当x为何值时,代数式(2x+9)\/(x+3)-1\/(x-3)与2+2\/x的值相等
(2x+9)\/(x+3)-1\/(x-3)=2+2\/x 方程两边同时乘以x(x+3)(x-3),化简方程得:12x=18 则x=3\/2
当x为何值时,代数式2x+9\/x+3-1\/x-3的值等于2
题目中的代数式应为(2x+9)\/(x+3)-1\/(x-3),则解答如下:由题意,得 (2x+9)\/(x+3)-1\/(x-3)=2 去分母并整理,得 2x²-6x+9x-27-x-3=2x²-18 即2x=12 ∴x=6.∴当x=6时,代数式的值为2.
(2x+9\/x+3)-(1\/x-3)-(2\/x)=2
(2x+9)\/(x+3)-1\/(x-3)-2\/x=2 (2x+6+3)\/(x+3)-1\/(x-3)-2\/x=2 2+3\/(x+3)-1\/(x-3)-2\/x=2 3\/(x+3)-1\/(x-3)-2\/x=0 3\/(x+3)=1\/(x-3)+2\/x 3\/(x+3)=[x+2(x-3)]\/[x(x-3)]3\/(x+3)=(3x-6)\/[x(x-3)]1\/(x+3)=(x-2)\/[x(x-3...
当x为何值时,代数式x+3分之2x+9-x分之2-x-3分之1的值等于2
(x+3)分之2x+(9-x²)分之2-(x-3)分之1=2?就是解分式方程:2x\/(x+3)-2\/(x²-9)-1\/(x-3)=2 2x(x-3)\/[(x+3)(x-3)]-2\/(x²-9)-(x+3)\/[(x-3)(x+3)]=2 2x(x-3)\/(x²-9)-2\/(x²-9)-(x+3)\/(x²-9)=2 2x(x-3...
2x+9=x+3
2x+9\/x+3 - (1\/x-3)- 2\/x=2x(x-3)(2x+9)-x(x+3)-2(x+3)(x-3)=2x(x+3)(x-3)x(2x²+3x-27)-x²-3x-2x²+18=2x³-18x2x³+3x²-27x-3x²-3x+18=2x²-18x-30x+18=-18x12x=18x=1.5 ...
解方程:2x+9\/x+3 - 1\/x-3 = 5 - 3x-2\/x 要含解答过程
x-3分之 2x+9减 x-3分之1 等于 5 减 x分之3x-2. 要是按这个解X=-1\/2 (2x+9)\/(x-3)- 1\/(x-3) = 5 - (3x-2)\/x ;化简得(2x+8)\/(x-3)=(2x+2)\/x;两边同乘以X(X-3),化简得2X^2+8X=2X^2-4X-6,即8X=-4X-6,所以X=-1\/2....
当x为何值时,代数式(x+3分之2x+9)-(x-3分之1)与2+(x分之2)的值相等
根据题意列关系式:(x+3分之2x+9)-(x-3分之1)=2+(x分之2)解此关系式: 由题目2x+x\/9+3-x-1\/3=2+2\/x,化简,得出:5x^2+3x-9=0,解出,x=(-3+3*根号21)\/10,或者=(-3-3*根号21)\/10
limx→0 [√(2x+9)-3\/(e^2x)-1)]求大神解!!!
limx→0 [√(2x+9)-3\/(e^2x)-1)]求大神解!!!limx→0[√(2x+9)-3\/(e^2x)-1)]...limx→0 [√(2x+9)-3\/(e^2x)-1)] 展开 我来答 1个回答 #热议# 《请回答2021》瓜分百万奖金 Talayspace0334 2015-01-12 · TA获得超过1342个赞 知道小有建树答主 回答量:660 采纳率:0...