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`x+y=3`
`<=>(x+y)^3=9`
`<=>x^2+2xy+y^2=9`
`<=>2xy+5=9`
`<=>2xy=4`
`<=>xy=2`
`<=>x^2-xy+y^2=3`
`=>M=(x+y)(x^2-xy+y^2)`
`=3.3`
`=9`
V/ tìm và sửa lỗi sai
1. I (1)can't (2)understand (3)what that tourist (4)is said
-> 4 said
2. We are (1)going to (2)give David (3)a big (4)surprising
-> 4 surprise
3. Those (1)at work must pay (2)to the welfare (3)benefits (4)in this country
-> 3 for the welfare
4. John (1)will have received the (2)papers (3)from -> by (4)tomorrow
5. He (1)works (2)hardly -> hard in (3)order (4)to pass the examination
6. The man (1)said he (2)was taking the train (3)tomorrow -> the following day (4)evening
7. That girl (1)allowed me (2)use -> to use her computer (3)at any time i (4)want
8. You (1)should (2)do morning (3)exercises (4)regular -> regularly
V/ tìm và sửa lỗi sai
1. I (1)can't (2)understand (3)what that tourist (4)is said
-> said
2. We are (1)going to (2)give David (3)a big (4)surprising
->surprise
3. Those (1)at work must pay (2)to the welfare (3)benefits (4)in this country
-> for the welfare
4. John (1)will have received the (2)papers (3)from (4)tomorrow
-> by
5. He (1)works (2)hardly in (3)order (4)to pass the examination
-> hard
6. The man (1)said he (2)was taking the train (3)tomorrow (4)evening
-> the following
7. That girl (1)allowed me (2)use her computer (3)at any time i (4)want
-> to use
8. You (1)should (2)do morning (3)exercises (4)regular
-> regularly
1. Vicky (1)said she (2)didn't know (3)where Michael (4)is => was
2. The womam (1)is => bỏ ''is'' standing next (2)to our teacher (3)is (4)my mother
3. He (1)is (2)proud (3)of his (4)wise=> wisdom
4. I (1)was so (2)excitement => excited (3)about the football match (4)last night
5. She (1)lives =>lived (2)in Rome (3)when she (4)was a little girl
6. He (1)will be (2)back (3)from => between 5:25 (4)and 6:20
1. Vicky (1)said she (2)didn't know (3)where Michael (4)was
2. The womam (1) bỏ "is" standing next (2)to our teacher (3)is (4)my mother
3. He (1)is (2)proud (3)of his (4)wisdom
4. I (1)was so (2)excited (3)about the football match (4)last night
5. She (1) lived (2)in Rome (3)when she (4)was a little girl
6. He (1)will be (2)back (3) between 5:25 (4)and 6:20
Mình không hiểu !
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