(1)--c²+(a+b)² (2)9a²x²--81x²y² (3)a²b--b3次方
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 02:32:35
![(1)--c²+(a+b)² (2)9a²x²--81x²y² (3)a²b--b3次方](/uploads/image/z/13321696-40-6.jpg?t=%281%29--c%26%23178%3B%2B%28a%2Bb%29%26%23178%3B+%282%299a%26%23178%3Bx%26%23178%3B--81x%26%23178%3By%26%23178%3B+%283%29a%26%23178%3Bb--b3%E6%AC%A1%E6%96%B9)
x)0MVS64HN҄44-!
kaeVkB$&?[ٴ6IE41WΆv.~|1h0i{mYh'BɱqO;YD&C:YȦZB]u%m
phq%* 4u$2ct˒$Xv8Pk~qAb(tݒ
(1)--c²+(a+b)² (2)9a²x²--81x²y² (3)a²b--b3次方
(1)--c²+(a+b)² (2)9a²x²--81x²y² (3)a²b--b3次方
(1)--c²+(a+b)² (2)9a²x²--81x²y² (3)a²b--b3次方
解(1)
原式=(a+b)²-c²
=[(a+b)+c][(a+b)-c]
=(a+b+c)(a+b-c)
(2):
原式=9x²(a²-9y²)
=9x²[a²-(3y)²]
=9x²(a+3y)(a-3y)
(3):
原式=b(a²-b²)
=b(a+b)(a-b)