AI b) Gọi I, J lần lượt là giao điểm của A với AC, và BA1. Tính tỉ số AC - Hãy xác định thiết diện của hình hộp ABCD.A'B'C'D' khi cắt bởi mặ phẳng qua ba điểm M, N, P tương ứng là ba điểm trong của ba mặt bên : a) (ABCD), (ABB'A'), (ADD'A') ; b) (ABCD), (A'B'C'D'), (ABB'A').

Giải giúp em câu 2c,d và câu 3 với ạ, xin cảm ơn.

UNIT 7 107. Mrs Linh has spent 550,000 VND on electricity __________ the last two months. 108. I’d rather go to the football field instead __________ being in class today. 109. Solar panels are installed __________ the roof of the house to receive the energy 110. We should spend less __________ lighting 111. Mrs Quyen bought corn potatoes and cabbages __________ the market 112. You should help elderly people __________ their chores

Mn giúp e vs ạ! E sẽ vote cho ạ

UNIT 6 100. The teacher told his students to clear up all the trash __________ the ground. 101. There is too much exhaust fume __________ the air. 102. They mustn’t cut down the trees __________ the forests. 103. I’m worried __________ my most recent water bill. 104. Remember to turn __________ the faucet after using it. 105. I want to turn __________ the radio to here the news. 106. The streams will be covered____________ plastics and tins.

UNIT 5 92. viewer can watch international program __________ different channels. 93. Remote controls are used to interact __________ TV 94. Viewers can watch international programs ___________ different channels. 95. What do you use the internet __________? 96. They read the news ____________ the internet. 97. I can also communicate __________ my friends by means of e-mail . 98. We should prevent students __________ throwing trash. 99. The baby laughed happily as she played __________ her toy.

làm nhanh nhé và làm đúng mình tích cho

UNIT 4 85. It’s interesting to listen to English programs __________ the radio. 86. He’s good at English, he can practice speaking English __________ native speakers. 87. She learned English __________ school and university. 88. Cong Vinh seems to be well-qualified __________ the latest position. 89. The boy was greatly proud __________ his success at school. 90. please hurry up or you’ll be lake __________ school. 91. I look forward __________ hearing form you.

kể lại một câu chuyện cổ tích mà em biết theo lời một nhân vật trong câu chuyện đó, ko chép mạng, dài 1 xíu

Tìm x,y € Z , biết: xy - 3x - 2y = 11