问题
填空题
若a、b满足
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答案
a+2b=3① 2a+b=-3②
∵①×2-②得：3b=9，
解得：b=3，
把b=3代入①得：a+6=3，
即a=-3，
∴a+b=3+（-3）=0，
故答案为：0．
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若a、b满足
|
a+2b=3① 2a+b=-3②
∵①×2-②得：3b=9，
解得：b=3，
把b=3代入①得：a+6=3，
即a=-3，
∴a+b=3+（-3）=0，
故答案为：0．
| 从方框中选择适当的选项，完成对话。其中有两项是多余的。 A: Excuse me! Could you please tell me where there's a good place to eat? B: 1 There are many good restaurants here. What do you like to eat? A: I like Italian food. So do you know where there are some Italian restaurants? B: Yes. We have two. One is on the Main Street, named Green L and. 2 called Sally's. A: 3 B: Sally's is a little nearer but it's expensive. A: What about Green Land? B: Green Land is farther but the food is both delicious and cheap. A: That's great! But _ 4 B: Go down the street and turn left at the third crossing. Then you will be on Main Street. You'll see Green Land between the post office and Milly's Cafe. A: 5 | |
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