HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
125 độ nha!
3/4
114 yến thóc, mình chưa kịp nghĩ lời giải nha!
(x+y)3−x3−y3(x+y)3-x3-y3
=(x+y)3−(x3+y3)=(x+y)3-(x3+y3)
=(x+y)3−(x+y)(x2−xy+y2)=(x+y)3-(x+y)(x2-xy+y2)
=(x+y)[(x+y)2−x2+xy−y2]=(x+y)[(x+y)2-x2+xy-y2]
=(x+y)(x2+2xy+y2−x2+xy−y2)=(x+y)(x2+2xy+y2-x2+xy-y2)
=(x+y).3xy
Of=>Of all my friends, Hoa is the most sociable
She also extreme=>is also extremely kind and generous
What's=>What about you? Are you kind and generous
is made
are caused
are employed
are shown
is covered
is surounded
are usually held
is-pronounced
are made
am taken
1 be cleaned
2 be opened
3 be made
4 be held
5 be recycled
6 be opened
7 be sent
8 be built
9 be used
10 be answered
Bottles of milk are brought to house by the milkman
How was language learned?
The cheque must be signed by the manager
I was kept wating for half an hour
I will be collected at the airport by John
A new ring road is being built round the city
Jeans can't be worn at work
Will she be invited to your birthday party?