EXERCISE 1: Chuyển các câu sau sang bị động
1) Some boys will clean the room later
2) The maganer must sign the antract today
3) You should do you homework before scholl
4) We eat wear Jeans at school
5) People can use a milk bottel thirty times
6) We cant't make tea with cold water
7) Nam has todo his homework after scholl
8) Children need to grow flowers in their house
9) They will send him those book
10) He isn't going to buy thay house
11) I want Lan to fixthe dishwater
12) People said that he live on frist
13) People used to behind that the laste stood still
14) They declared that see than the competition
15)They say that John was the tables in his chool
16) People saw him steal your car
17) They made his wrote all of
18) People say that money was evething
1) Thực hiện phép tính :
a) \(3\sqrt{2}\cdot\left(\sqrt{50}-2\sqrt{18}+\sqrt{98}\right)\)
b) \(\sqrt{27}-3\sqrt{48}+2\sqrt{108}-\sqrt{\left(2-\sqrt{3}\right)^2}\)
c) \(\sqrt{0.4\cdot0.25\cdot0.1}\)
2) Cho bt
A = \(\frac{x-4\sqrt{x}+4}{\sqrt{x}-2}+\frac{x+\sqrt{x}-2}{\sqrt{x}+2}\)
a) Đặt đk để bt A có nghiệm
b) Rút gọn A
c) Tính GTBT A nếu x = \(1\frac{7}{9}\)
3 Giải phương trình
a)\(\sqrt{x^2-8x+16}-x=2\)
1) Cho mạch điện gồm :Rnt ( R1 // R2 ). Ampe kế Ađo cđdđ qua R1, ampe kế A2 đo cđdđ qua R2. Biết R1=20 Ω, R3=10 Ω . Ampe kế A1=1.5A. Ampe kế A2 chỉ 1.0 A. Các dây dẫn nối
và ampe kế có điện trở không đáng kể
a) Tính điện trở R2
b) Tính hiệu điện thế của mạch