> 数学 >
已知a≠0,b≠0,且
1
a
+
1
b
=4,那么
4a+3ab+4b
-3a+2ab-3b
= ___ .
人气:432 ℃ 时间:2020-01-29 07:33:52
解答
1
a
+
1
b
=4,
∴a+b=4ab,
4a+3ab+4b
-3a+2ab-3b
=
4(a+b)+3ab
-3(a+b)+2ab
=
19ab
-10ab
=-
19
10

故答案为-
19
10
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