搜搜做题作业网1.约分（1）5x / 25x^2 &
来源：学生作业帮 编辑：搜搜做题作业网作业帮 分类：数学作业 时间：2024/04/28 20:38:03
1.约分（1）5x / 25x^2 (2)9ab^2+6abc / 3a^2b (3)9a^2+6ab+b^2 / 3a+b (4)x^2-36 / 2x+12
1.约分（1）5x / 25x^2
=-1/5x
(2)9ab^2+6abc / 3a^2b
=3ab(3b+2c)/3a²b
=(3b+2c)/a
(3)9a^2+6ab+b^2 / 3a+b
=(3a+b)²/(3a+b)
=3a+b
(4)x^2-36 / 2x+12
=(x+6)(x-6)/2(x+6)
=(x-6)/2
=-1/5x
(2)9ab^2+6abc / 3a^2b
=3ab(3b+2c)/3a²b
=(3b+2c)/a
(3)9a^2+6ab+b^2 / 3a+b
=(3a+b)²/(3a+b)
=3a+b
(4)x^2-36 / 2x+12
=(x+6)(x-6)/2(x+6)
=(x-6)/2