3减5x等于80 解方程:过程…… 6x(7-x)=36-2x(3x-5) (x+6)(x-5)-(x-1)(x+4)=-24
解方程:过程…… 6x(7-x)=36-2x(3x-5) (x+6)(x-5)-(x-1)(x+4)=-24
解方程:过程…… 6x(7-x)=36-2x(3x-5) (x+6)(x-5)-(x-1)(x+4)=-24
(1)8x=9 x=9/8
(2)-2x-24=-24 x=0
解方程:6x(7-x)=36-3x(2x-15)
解:6X(7-x)=36-3X(2X-15)
42X-6XX=36-6XX+45X
42X-45X=36
-3X=36
X=-12
解方程(3x-2)(2x-3)=(6x 5)(x-1)
(3x-2)(2x-3)=(6x 5)(x-1)
(3x-2)(2x-3)=30x(x-1)
(3x-2)(2x-3)=0
3x(2x-3)-2(2x-3)=0
6x-9x-4x-6=0
0=9x+4x-6x+6
0=7x+6
负6=7x
x=?
解方程7*(x+6)-3x=4*(2x+5)
x=5.5
解方程 (1)3(x^2-2x-6)-3x(x-5)=0 (2)x(2x-4)+3x(x-1)=5x(x-3)+8
(1)3(x^2-2x-6)-3x(x-5)=0
3x²-6x-18-3x²+15x=0
9x=18,x=2;
(2)x(2x-4)+3x(x-1)=5x(x-3)+8
2x²-4x+3x²-3x=5x²-15x+8
5x²-7x=5x²-15x+8
8x=8
x=1
解方程.(1)3(x2-2x-6)-3x(x-5)=0;(2)x(2x-4)+3x(x-1)-5x(x-3)+8
(1)方程即:3x2-6x-18-3x2+15=0,
即-6x-18+15=0,
移项,得:-6x=18-15,
即-6x=3,
则x=-
;
(2)原式=2x2-4x+3x2-3x-5x2+15x+8
=8x+8.
(3x-2)(2x-3)=(6x=5)(x-1)+15解方程
(3x-2)(2x-3)=(6x-5)(x-1)+15
——》6x^2-13x+6=6x^2-11x+5+15
——》x=-7;
1、原式=-10xy*(2x^2-3xy^2)=30x^2y^3-20x^3y;
2、原式=2x^2y+3xy-x^2y=x^2y+3xy;
3、原式=6a^3-27a^2+9a-8a^2+4a=6a^3-35a^2+13a;
4、原式=4x^4*(-27x^3)=-108x^7;
5、原式=x^2-x+2x^2+2x-6x^2+17x-5
=-3x^2+18x-5
=-3*4+18*2-5
=19。

解方程(x+3)(x+4)(x+5)(x+6)=44,过程
令x+4.5=t
(t-1.5)(t-0.5)(t+0.5)(t+1.5)=44
(t*t-0.25)(t*t-2.25)=44
令t*t=q
(q-0.25)(q-2.25)=44
q*q-2.5q-347/8=0
接下来你自己应该可以解了