问题
填空题
若a-b=5，ab=3，则(7a+4b+ab)-6(
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答案
原式=7a+4b+ab-5b-6a+6ab
=a-b+7ab，
当a-b=5，ab=3时，原式=5+21=26．
故答案为：26．
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若a-b=5，ab=3，则(7a+4b+ab)-6(
|
原式=7a+4b+ab-5b-6a+6ab
=a-b+7ab，
当a-b=5，ab=3时，原式=5+21=26．
故答案为：26．
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| A: Hello, Jack. Come here, please. Do you know the 1 in school? B: Yes, Mr. Brown. First we 2 wear hats in school. A: That’s right. B: Don’t arrive late for 3 . A: Good. What 4 ? B: Do we 5 eat in the dining hall? A: No, you don’t. You 6 eat outside. B: And we can 7 music outside, but not in the classrooms. A: Yes. B: We can’t 8 anyone. A: Yes. You should be friendly. Can we 9 in the hallways, little boy? B: No. It’s dangerous. A: You’re right, my little boy. Then why did you run in the hallways? B: Sorry, Mr. Brown. I won’t 10 school rules again. |