Giải giúp mình câu c, d với Cảm ơn nhiều!!!

1. Cho đa thức f(x) thỏa mãn (x -4x +3)ƒ(x+1)=(x-2)f(x-1). Chứng tỏ rằng đa thức f(x) có ít nhất 3 nghiệm.

Giúp mình với ạ khoanh thôi từ câu 11

Ex 2: Choose the best answer to fill in the blank. 91. If he ………………..so hungry, he will eat that cake. A. is B. are C. be D. does 92. They cancelled their picnic ...........the weather was bad A. because B. when C. but D. so 93. There aren’t ……… good films on TV at the moment. A. some B. any C. much D. a lot 94. If the weather ……………… good, I ………………. camping with classmates. A. is / will go B. is / go C. will be / go D. will be / will go 95. We _______________ go to the party. We’re going to a wedding. A. Couldn’t B. won’t be able to C. Will can’t D. want be able to 96. Mary : Can you lend me some money? Peter : Sorry. I ___________ . I haven’t got any either. A. Couldn’t B. am not able to C. Can’t D. won’t be able to 97. They________ go. The weather was too bad. A. Weren’t able to B. cant C. Won’t be able to D. couldn’t 98. She________ come on holiday next month if her parents give her permission. A. Can’t B. will be able to C. Could D. couldn’t 99. The fishing boat sank but luckily all the crew ________ save themselves. A. Could B. will be able to C. Were able to D. can 100. Listen! We ____________ hear a train in the distance. A. Can B. could C. Will be able D. were able to

Đơn giản biểu thức dưới đây: C = ( 1 + cot $\alpha$ ) $sin^{3}$ $\alpha$ + ( 1 + tan $\alpha$ ) $cot^{3}$ $\alpha$ Ghi đầy đủ lời giải = ctlhn

Ex 2: Choose the best answer to fill in the blank. 81. How many floors ________ in your school? A. there are B. there has C. are there D. have there 82. She doesn’t have ________friends at school. A. a B. some C. many D. much 83. – “_____________ a nice T-shirt, Trang!” – “Thank you.” A. How B. What C. Which D. It 84. – “_____________ is the most expensive city in the world?” – “I think it’s Tokyo.” A. Which B. Where C. What D. How 85. We should use reusable water bottles………………..plastic ones. A. because B. instead of C. despite D. however 86. What can we do……………….air pollution? A. reduce B. to reduce C. reducing D. to reducing 87. If we use……………….paper, we will save a lot of trees. A. less B. fewer C. more D. much 88. We …………….live in the city in the future. A. will B. won’t C. don’t D. do 89. He will………………..some pictures with his camera. A. takes B. taking C. take D. took 90. If we plant more trees, the air ………………be so polluted. A. will B. won’t C. do D. is

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Ex 2: Choose the best answer to fill in the blank. 71.I think it is a very nice town the weather is good and the people are friendly. A. because B. if C. so D. although 72. This is the first time that I a 3D film. A. watch B. watched C. watches D. have watched 73. I Da Lat three times in all. A. visit B.visited C.visiting D. have visited 74. People must be well-prepared ¬¬they want to climb Mount Everest. A. after B. until C. although D. before 75. I have been to Nha Trang_____How about you? A. one B. two C. two times D. twice 76. My father ________ to Ha Long Bay tomorrow. A. will visit B. visits C. to visit D. are visiting 77. They are going to New York ________ car. A. in B. by C. with D. on 78. ________ they live on the moon in the future? A. Did B. Does C. Do D. Will 79. My sister and I ________ television in the living room now. A. am watching B. are watching C. is watching D. watching 80. ________ do you go to school? . I walk. A. How B. By what C. How many D. How