đợi chút bạn ơi, sao lại là 2CO₂ + CaCO₃ + H₂O → Ca(HCO₃)2, phương trình sai rồi kìa

1. she doesn't sleep late on weekend

2. we don't believe ghots

3. do you understand the question?

4. they don't work late on Fridays

5.David want some coffee?

6. she has three daughters

7. when does she goto her chinese class?

8. why do I have to clean up?

2/5 + 3/5 . x = -1/4

3/5 . x = 2/5 - -1/4

3/5 . x = 13/20

x = 13/20 : 3/5

x= 13/12

bài này làm dễ mà