17. Tính a) -2/5 : 11/6 b) -4/13 : -1/13 c) ( -2 ) : 11/6 d) -14/13 : 7 đ) -5/19 : 20 g) 24 : -8/9 h) 9/11 : 7/22

`C=x^2 y^2 + 2xy - 3x^2 y + 4xy -5+3x^2 y^2 + x^2 y` `D=2xy+3-8xy-3(xy)^2 + 5x^2 y + 1` Tính giá trị của `E` khi `x/2 + y/3 = 0` và `2x-y=-7`

Giúp mình với mình đang cần gấp

tìm 2 số a và b biết a/b=2/3 và a+b =10

Rewrite the sentences in a way that is has similar meaning to the original sentences: 1. No one in the class is as tall as Jack -> Jack is 2. The weather is too cold for us to go out -> the weather is so 3. We wrote this letter for two houses -> It took 4. The children liked to walk in the rain -> 5 This house is very beautiful -> 6 My grandmother is very old. She can't work now -> My grandmother is too

Lm hết 10p 5 sao + ctlhn+ cảm ơn

1 It is interesting.....fishing with you a. go b. going c. to go d. goes 2 Japan has a big......industry a. car-making b. make-car c. making-car d. car-make 3 Last summer vacations, we decided....to DaLat city a. to get b. to go c. to do 4 Can i get you some drink?-.......... A. good b. Yes, please c. OK d. never mind 5 i saw him......the flowers in the garden a. watering b. watered c. be watered d. be watering 6 They are tired....doing the same thing every day a. in b. of c. at d. with Làm và giải thích hộ mình

Ảnh hưởng của nhiệt độ lên đời sống sinh vật ?

giúp mình với 1,Tìm x a,|x| = 1/2 = 3/4 b,|x - 1/2| - 3/4 = 1/4 c,1/20 - |3/2- x| = 1/40 d, ( x + 1/3 ) ² + 4/9 = 8/9 2.Tính hợp lí a,A = 1/1.2 + 1/2.3 + 1/3.4 + 1/4.5 + 1/5.6 + 1/6.7 + 1/7.8 b,B = 2/1.3 + 2/3.5 + ...... + 2/11.13 Làm nhanh nha mik đang cần rất rất gấp

12B. Tính giá trị biểu thức a) 3/11 : ( 1/5 : 4/7 ) b) ( 1/9 : 2/27 ) . 9/4 c) ( 15/21 : 5/7 ) : ( 6/5 : 2 ) d) ( 8/21 . 9/14 ) : ( 1/3 . 6/7 )