问题
计算题
18a2﹣32b2﹣18a+24b.
答案
解:18a2﹣32b2﹣18a+24b
=2(9a2﹣16b2﹣9a+12b)
=2[(9a2﹣16b2)﹣3(3a﹣4b)]
=2[(3a+4b)(3a﹣4b)﹣3(3a﹣4b)]
=2(3a﹣4b)(3a+4b﹣3).
18a2﹣32b2﹣18a+24b.
解:18a2﹣32b2﹣18a+24b
=2(9a2﹣16b2﹣9a+12b)
=2[(9a2﹣16b2)﹣3(3a﹣4b)]
=2[(3a+4b)(3a﹣4b)﹣3(3a﹣4b)]
=2(3a﹣4b)(3a+4b﹣3).