问题
填空题
将方程3x-2y=1变形成用y的代数式表示x,则x =___________.
答案
要用含y的代数式表示x,就是把方程变形为x=ay+b(a,b为常数),所以一般要先移项,再系数化1.
将方程3x-2y=1变形成用y的代数式表示x,则x =___________.
要用含y的代数式表示x,就是把方程变形为x=ay+b(a,b为常数),所以一般要先移项,再系数化1.
从方框中选择适当的句子完成对话,其中有两项是多余的。 | |
A: Can I help you? B :Yes, please.1______ A: We have sweaters in red, yellow, and white.2______ B: Yellow. A: Here you are. B: Oh, this sweater is too small.3______ A: Yes. What about this one? B: It's very nice.4______ A: It's ten dollars. B: OK.1 will take it. 5______ A: You are welcome. | |
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