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giải giúp bài 8, hứa vote NẾU GIẢI ĐÚNG (copy = báo cáo)

2 bài này em ko biết sinh ai chỉ em

các công thức tìm x cộng trừ nhân chia

Câu 2: Trên cùng một nửa mặt phẳng bờ là đường thẳng chứa tia......

Read the passage and decide which answer A, B, C or D best fits each space. When life changes so fast, the family life will change, too. So what will a family be (26)________ after a hundred years? We can't have the correct answers. Parents will have (27)________ babies. They can even choose their child's hair or eye color. The mother will be busy but she will get help (28)________ somefriendly house-robots. When the family goesout together, they will travel on flying cars. These cars will be much faster and there will be no traffic jams (29)________ each flying car can have its own way. There will be love and (30)________ between the family members. 26.A. as B. enjoy C. like D. so 27.A. healthful B. healthier C. healthiest D. health 28.A. at B. with C. of D. from 29.A. but B. although C. because D. so 30.A. care B. carefully C. careful D. careless

Tìm nghiệm: $x^{4}$ + 2$x^{2}$ + 5

Chứng minh rằng giá trị các biểu thức sau không phụ thuộc vào giá tri của biến x: b) x(2x+1)-x2(x+2)+x3-x+3

Give the correct form of the verbs in the brackets to complete the sentences. 22. Mr. Green (play) ________ chess since eight o'clock. 23. We should (practice) _________English everyday. 24. We won't go to the beach tomorrow if it (rain)________ 25. Our school performance (start) ________ late last Sunday because of the heavy rain.