计算1、(x-3y)(x-6y-1);2、(3a-b)(3a+b+5);3、(2x-1)(x²-x-1);
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/10 20:46:15
计算1、(x-3y)(x-6y-1);2、(3a-b)(3a+b+5);3、(2x-1)(x²-x-1);
4、2x(x²-2x+3)-(x+5)(2x-3);5、3(2a+1)(2a-1)-4(3a-2)(3a+5).
求解!
4、2x(x²-2x+3)-(x+5)(2x-3);5、3(2a+1)(2a-1)-4(3a-2)(3a+5).
求解!
1、(x-3y)(x-6y-1);
=x²-6xy-x-3xy+18y²+3y
=x²-9xy+18y²-x+3y
2、(3a-b)(3a+b+5);
=(3a-b)(3a+b)+5(3a-b)
=9a²-b²+15a-5b
3、(2x-1)(x²-x-1)
=2x³-2x²-2x-x²+x+1
=2x³-3x²-x+1
4、2x(x²-2x+3)-(x+5)(2x-3);
=2x³-4x²+6x-(2x²+7x-15)
=2x³-6x²-x+15
5、3(2a+1)(2a-1)-4(3a-2)(3a+5).
=3(4a²-1)-4(9a²+9a-10)
=-24a²-36a+37
=x²-6xy-x-3xy+18y²+3y
=x²-9xy+18y²-x+3y
2、(3a-b)(3a+b+5);
=(3a-b)(3a+b)+5(3a-b)
=9a²-b²+15a-5b
3、(2x-1)(x²-x-1)
=2x³-2x²-2x-x²+x+1
=2x³-3x²-x+1
4、2x(x²-2x+3)-(x+5)(2x-3);
=2x³-4x²+6x-(2x²+7x-15)
=2x³-6x²-x+15
5、3(2a+1)(2a-1)-4(3a-2)(3a+5).
=3(4a²-1)-4(9a²+9a-10)
=-24a²-36a+37
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
1.计算(a^2+a+1)(a^2-a+1) 2.计算(x-y)(x+y)+(3x-2y)(2x+y)-x(6x-y)
①3a(5a-2b) ②(x-3y) ×(-6x) ③化简x(x-1)+2x(x+1)-3x(2x-5)
计算:(x-3y)(x-6y-1)= (3a-b)(3a+b+5)= 2x(x的2次幂-2x+3)-(x+5)(2x-3
计算:(1) (2x-3y)+(5x+4y) (2) (8a-7b)-(4a-5b)
已知:6x²-7xy-3y²+14x+y+a=(2x-3y+b)(3x+y+1)求a,b的值
1.已知集合A={(x,y)|y=2x+1},B={(x,y)|y=x+3},a∈A,b∈B,求a
已知集合A={(x,y)| (y-3)/ (x-1)=2,x,y∈R},B={(x,y)| 4x+ay=16,x,y∈
初一几道计算忘了.x²-5x=2a(x-2y)-3b(2y-x)-4c(x-2y)=-5x²y
(1)(3a-3b)+6(b-a) (2)5x(x-3y)^2-(3x+2y)(3y-x)^2
分式的通分与约分①:x/a(x-y),y/b(y-x);②:1/x^2-1,2x/x^2-3x+2;
计算 1.[(a+b)^2-(a+b)(a-b)]÷(-b) 2.[(x+y)(2x+y)+(x+y)(x-y)]÷3x