(7X+70):(3X+70)=7:4 要有思路和方法

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(7X+70):(3X+70)=7:4 要有思路和方法
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(7X+70):(3X+70)=7:4 要有思路和方法
(7X+70):(3X+70)=7:4 要有思路和方法

(7X+70):(3X+70)=7:4 要有思路和方法
(7X+70)*4=(3X+70)*7
28X+280=21X+490
28X-21X=490-280
7X=210
X=30

已知f(x-1)=x²+4x-5则f(x)的表达式是() A x²+6x B x²+8x+7已知f(x-1)=x²+4x-5则f(x)的表达式是()A x²+6xB x²+8x+7C x²+2x-3D x²++6x-10 解九宫格题目(X为未知数)9 X 2 X 7 X 8 X XX X 4 X X 9 X 6 X1 3 X 5 X X X X 24 X X 8 5 X X 1 XX 8 9 4 X 1 6 7 XX 1 X X 3 6 X X 88 X X X X 2 X 3 6X 5 X 6 X X 9 X XX X 7 X 4 X 2 X 1 x+3×(x+1)等于27 7x-2(x-5)=40 6x+4(10-x)=46 x+3×(x+1)等于27 7x-2(x-5)=40 6x+4(10-x)=46 先化简,再求值:x×x³+(-4x²)²+24x∧7÷(-3x³) 其中x=-2. 0.3+0.3x=0.39 x= 2x-1.5x=7.6x x= 0.36x÷0.3=1.2 x=6(x+1.2)=18.6 x= 7x+2x = 8.1 x= (x-5)÷3=1.7 x=5(x+1.1)=15.5 x= 9x+25=70 x= 7x-4x=2.1 x= x²+1/x²-3(x+1/x)+4=0 3x²-12x-2√(x²-4x+7)+13=0要答题过程, 谁能帮我解下列一元二次方程啊(4x+3)(5-X)=02X^2-4X-5=03x(x-1)=2-2xx(x+6)=7(x-1)^2+2x(x-1)=0-3x^2-4x+4=0(X-1)(X+2)=70(3-X)^2+X^2 7:x=14:(2+x)求x (x+6)(x-7)-(x-4)(x+3)=?检算 6(x-4)-4(x+8)+3(2x-7)=3x-2 数学题(x-4)/(x-3)+(x-6)/(x-5)=(x-8)/(x-7)+(x-10)/(x-9)解方程,(x-4)/(x-3)+(x-6)/(x-5)=(x-8)/(x-7)+(x-10)/(x-9)解方程, 解方程:(x-8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3) 0.3x+7x-0.25x=21.58.7×(36-x)=04(不知道是x还是× 都解了吧)x或者×(x+0.2)=1.27(x+6)-3x=4x(2x+5)3(x+2)=4(x+1)18-4x=2x-63.8x+1.2x=256x+1.5x=15呼呼.累死我了 着急 因式分解∶x³-4x²+7x-6解∶原式=x³-4x²+4x+3x-6 =x(x²-4x+4)+3(x-2) =x(x-2)²+3(x-2)=[x(x-2)+3](x-2)=(x²-2x+3)(x-2) 这样分解 5x/(x+3)(x+2)+(2x-5)/(x-4)(x+3)=(7x-70)/(x+2)(x+4)求求大家帮个忙,怎么接着道方程啊! *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 若|x|=7,若|x|=0 则x= 5-3x²+5x-(2x²-3x) (X²-3x+1)(三分之二x²-5x-3)