Đáp án + Giải thích các bước giải:
`b)`
`x^{2}+2xy-9+y^{2}`
`=(x^{2}+2xy+y^{2})-9`
`=(x+y)^{2}-3^{2}`
`=(x+y-3)(x+y+3)`
`c)`
`x^{2}-3xy-10y^{2}`
`=(x^{2}-5xy)+(2xy-10y^{2})`
`=x(x-5y)+2y(x-5y)`
`=(x-5y)(x+2y)`
`d)`
`2x^{2}-5x-7`
`=(2x^{2}+2x)-(7x+7)`
`=2x(x+1)-7(x+1)`
`=(x+1)(2x-7)`
Đáp án + giải thích các bước giải: ở hình
Mọi người ơi giúp mình bài 5 nhé. Mong mọi người trình bày lời giải giúp mình ạ. Cảm ơn mọi người nhiều lắm ạ
Calli: JungKookie<3 ( Ko dùng giấy ô li, kẻ gạch nha) NL: happy birthday Chây Khây
làm giúp mik 1 trong 2 bài này với ạ TT_TT
A ) Calculate 13.8 x 4.6 x 5.4 : 1.38 : 2.3 : 2.7 = ____________ B ) One is putting ping pong balls into 11 boxes. In each of the boxes, number of ping pong balls shall not be less than 10, not equal to 13 and is not multiple of 5. If the number of ping pong balls is different in each box, one needs at least _______ ping pong balls to fill in all the 11 boxes. C ) From point A, a robot walks to the south for 1.2 meter, then walks 1 meter to the east, follow by another 1.8 meter to the south. Then he walks another 2 meters to the east and again 1 meter to the south before reaching point B. What’s the straight line distance between point A and B?
Làm thời khóa biểu nha:D Có tổng cộng 8 tiết 5 tiết sáng 3 tiết chiều, kẻ ô từ thứ 2 đến thứ 7 bỏ thứ 5, app hoặc giấy đều được, có trang trí, có tâm ạ:D
III. Give the correct form of the verbs in brackets. 1. My brother (start)…………………..the hobby ten years ago after a trip to Da Lat. 2. We find (arrange)…………………...flowers interesting because it (help)…………....us relax. 3. In my opinion, in the future people (not play)……………….individual games. 4. Does your sister like (listen)……………....to pop music in her free time? 5. I think in the future, more people (enjoy)……………….going out by bicycles. 6. My father says when he is retired, he (go)………………...back to his village to do the gardening. 7. We are planting trees around our school now. Our school (be)…….surrounded by a lot of green trees. 8.Lan says she loves (collect) …………. pens but she (not continue)……………..this hobby from next year. 9. I don’t think we (have)………………………… free time. 10. My brother (listen)………………………… to music every day. 11. Nga (share) ………………………………..this hobby with anyone? 12. I think (make)……………………………. models is interesting. 13. I find (carve)…………………………….. wood boring
Làm nhanh hộ mik trong 5 phút nha mm
21) I have some tickets available (for/to/of/with) you. 22) Are you capable (with/of/for/to) that job? 23) He is accustomed (to/with/for/in) driving fast like this. 24) Are you confident (with/of/about/in) what she has said? 25) The room was available (with/for/to/on) 2 people. 26) Finally, Jack is successful (on/in/at/to) his trade. 27) This theatre is often crowded (with/to/on/about) viewers. 28) Your bag is similar (with/to/about/for) mine. 29) The bottle is full (with/of/in/at) water.
tìm giá trị của x:căn của 27 +10căn2- căn của 18+8căn2.
Giải hệ phương trình x+1=2(y-1)=2(y-1) x-1= y+1
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