Cho a/b=c/d chứng minh rằng 3a-2c/3b-2d=a+3c/b+3d

Viết đoạn văn ngắn giải thích hiện tượng trong thiên nhiên: "Mưa tháng ba hoa đất, Mưa tháng tư hư đất ".

Exercise 2. More than two hundred years ago, the term environment pollution was quite strange to people. They lived healthily, drank pure water and breathed fresh air. Nowadays, the situation is quite different. People all over the world are worried about things that are happening to the environment. Actually it is man that is destroying the surroundings with many kinds of wastes. Everybody knows that motorbikes and cars emit dangerous gases that cause poisonous air and cancer, but no one wants to travel on foot or by bicycle. Manufactures know that wastes from factories make water and soil polluted, but they do not want to spend a lot of their money on treating the waste safely. Scattering garbage is bad for our health, but no one wants to spend time burying it. Is it worth talking a lot about pollution? 1. How did people live more than two hundred years ago? ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… 2. What is the man doing with his environment? ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….. 3. What do the gases from motorbikes and and cars cause? ………………………………………………………………………………………………………………………………….. 4. Do the factories make water and soil polluted?

Một cửa hàng có 500kg gạo. Buổi sáng bán được 10% số gạo đó, buổi chiều bán được 15% số gạo đó. Hỏi số gạo còn lại là bao nhiều ki – lô – gam? Mn làm giúp mk nhé. Cảm ơn😍😍

Làm hộ mình bài 6 ,7,8 với mình cần gấp

(x-1)(x^2+1)=0 giúp mình vớiiiiiiiiiiiiiii ai trả lời trước mình sẽ tick

Supply with reflexive pronouns 1 we protect .... From the rain with an umbrella 2 both boys taught .... To Swim 3 The Chilren Amuse ..... With The Kitten 4 You With Cut .... With That Knife If You Are Not Careful 5 She Likes To Look At .... In The Mirror 6The Boy Is Not Old Enough To Dress.... 7The Dog Hurt ...When It Jumped Over The Fence 8Helen And I Enjoyed ...Very Much At The Party Last Night 9YOu ShoUldn't Really Blame ...For That Mistake 10I Must Learn To Control ...

mọi người dịch giùm em đoạn văn ạ

giải các phương trình sau 1 x-23/24+x-23/25=x-23/26+x-23/27

Đơn giản biểu thức : a, (x+17) - (24+35) b, (-32)-(y+20)+20 MỌI NGƯỜI GIẢI ĐÀNG HOÀNG KHÔNG EM TỐ CÁO ĐÓ. HỨA VOTE 5 sao