4(2x+y) -9(x-2y)

来源：学生作业帮助网 编辑：作业帮 时间：2024/11/24 02:10:11
4(2x+y) -9(x-2y)
x}Q 0 -*؃@,*cν˗4) kح,S T׫;BR)Ah(Z4\)i->wUs04^6 A$stsy; 3q/Th

4(2x+y) -9(x-2y)
4(2x+y) -9(x-2y)

4(2x+y) -9(x-2y)
4(2x + y)² - 9(x - 2y)²
= [2(2x + y)]² - [3(x - 2y)]²
= [2(2x + y) + [3(x - 2y)][2(2x + y) - 3(x - 2y)]
=(7x - 4y)(x + 8y)

4(2x+y) -9(x-2y)
=8x +4y -9x +18y
=8x-9x+4y+48y= 22y - x

收起 4(2x+y) -9(x-2y)
=8x +4y -9x +18y
= 22y - x