Đáp án:
`a, (x-3).(x+3)^2 ; b, (x-5). (x-2)`
Giải thích các bước giải:
`a, x^3 - 27 + 3.x.(x-3)`
`= x^3 + 3.x^2 -( 9x +27)``= x.^2 . (x+ 3) - 9.(x+3)``= (x^2 - 9).(x+3)``= (x-3).(x+3).(x+3)``= (x-3). (x+3)^2`
`b, x^2 - 7.x + 10`
`= x^2 - 2.x - 5.x + 10`
`= x. (x-2) - 5. (x-2)`
`= (x-5).(x+2)`
@Active Activity
$a.(x-3).(x+3)^2\\b.(x-2).(x-5)$
$a.\\x^3-27+3x(x-3)\\=(x-3).(x^2+3x+9)+3x(x-3)\\=(x-3).(x^2+3x+9+3x)\\=(x-3).(x^2+6x+9)\\=(x-3).(x^2+2.3.x+3^2)\\=(x-3).(x+3)^2$
$b.\\x^2-7x+10\\=x^2-5x-2x+10\\=(x^2-5x)-(2x-10)\\=x(x-5)-2(x-5)\\=(x-2).(x-5)$
1. Do your exercises or you will fail the exam. -If___________________________________ -Unless_______________________________________ -If___________________________________ 2. Save some money or you won’t able to buy the house. -If______________________________________ -Unless_______________________________________ -If___________________________________ 3. Behave yourself or your parents will be very unhappy. -If______________________________________ -Unless_______________________________________ -If___________________________________ 4. Do it carefully or you’ll feel sorry afterwards. -If______________________________________ -Unless_______________________________________ -If___________________________________ 5. Ask him first or he won’t offer to help. -If______________________________________ -Unless_______________________________________ -If___________________________________ 6. Be calm or you’ll make a wrong decision. -If______________________________________ -Unless_______________________________________ -If___________________________________ 7. Be careful or you’ll cut yourself with that knife. -If______________________________________ -Unless_______________________________________ -If___________________________________ 8, Study hard or you won’t pass the exam. -If______________________________________ -Unless_______________________________________ -If___________________________________ 9, Don’t be impatient or you will make mistakes. -If______________________________________ -Unless_______________________________________ -If___________________________________ 10, Leave me alone or I’ll call the police. -If______________________________________ -Unless_______________________________________ -If___________________________________
tìm nghiệm nguyên của phương trình x^4-4x^2+y^2+2x^2*y-9=0
reported speech 1. “My mother died of cancer in 1985,” Tom said to me 2. They said, “we were in London last week.” 3. They said, “ We have never been here before.” 4. “I worked for a bank in KG”, he said 5. “I was watching TV at 8:00 last night.” She said
Xe thứ nhất chở được 40 tấn hàng xe thứ hai chở 50 tấn hàng. Xe thứ ba chở bằng trung bình cộng 3 xe. Hỏi xe thứ 3 chở bao nhiêu tấn hàng?
Tính giá trị nhỏ nhất của biểu thức (Min)
Phá bớt lớp căn, biến đổi biểu thức trong căn thành tổng/hiệu 1 bình phương.
giải hộ mình câu 6 nhaaaa thank <3 mình sẽ vote 5 sao
Lập dàn ý:)) Cảm nhận về 1 chuyến về quê(nội hoặc ngoại)
rút gọn biểu thức ( x- 2 ) ( x mũ 2 + 2x +4 ) - x ( x mũ 2 - 2) cần liền
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