问题
计算题
用适当的方法解下列方程:
(1)x2=x;
(2)x2-x-1=0;
(3)2x(3x+1)=3(1+3x);
(4)x2=8x+20。
答案
解:(1)x1=0,x2=1;
(2),
;
(3),
;
(4)x1=-2,x2=10。
用适当的方法解下列方程:
(1)x2=x;
(2)x2-x-1=0;
(3)2x(3x+1)=3(1+3x);
(4)x2=8x+20。
解:(1)x1=0,x2=1;
(2),
;
(3),
;
(4)x1=-2,x2=10。
从方框中选出最佳答案,有多余选项。 | |
A: Hi, Kate, you look so worried. What's the matter? B: 1 I've got a headache, a runny nose and a sore throat. You know the A/H1Nl virus (病毒) is so scary. I fear. . . A: 2 B: No, I don't. I took my temperature just now. A: Don't worry. A fever is the common symptom (症状) of the disease. 3 B: I hope so. A: 4 You can get some advice. B: That's a good idea. 5 A: Sure. Let's go. | |
1._____2._____3._____4._____5._____ 6._____7._____8._____9._____10._____ |