计算下列各式

题目

计算下列各式
1.(2X+Y)(3a+2B)
2.(4X-3)(X+4)
3.(3X+2Y)(2X-3Y)
4.(3Y-1)(2Y-3)+(6Y-5)(Y-4)

答案

1.(2X+Y)(3a+2B) =6aX+4BX+3aY+2BY2.(4X-3)(X+4) =4X^2+16X-3X-12=4X^2+13X-123.(3X+2Y)(2X-3Y) =6X^2-9XY+4XY-6Y^2=6X^2-5XY-6Y^24.(3Y-1)(2Y-3)+(6Y-5)(Y-4)=6Y^2-9Y-2Y+3+6Y^2-24Y-5Y+20=12Y^2-35Y+23=(12Y-1)(Y-...