Đáp án:
Ta có
`12^8 . 9^{12}`
` = (3.4)^8 . 9^{12}`
` = 3^8 . 4^8 . 9^{12}`
` = (3^2)^4 . (2^2)^8 . 9^{12}`
` = 9^4 . 2^{16} . 9^{12} `
` = 9^{16} . 2^{16}`
` = (9.2)^{16}`
` = 18^{16}` (đpcm)
Giải thích các bước giải:
Ta có: 12⁸×9¹²= (3x 4)⁸ x (3²)^24
= 3⁸ x 4⁸ x 3^24
= (3⁸ x 3^24) x (2²)⁸
= 3^32 x 2¹⁶
= (3²)⁸ x 2¹⁶
= 9¹⁶ x 2¹⁶
=18¹⁶ (dpcm)
3.|2-3x|= |x+5| làm giúp mik nha
Viết lại câu: 1.She said, “I can’t find my umbrella”. ……………………………………………………… 2.They said, “We are learning English now”. ………………………………………………………………………………………………………. 3.“My friend is coming next week”, Tom said. ……………………………………………………. 4.“I’ll help my mum with housework this weekend” he said. ………………………………………………………………………………………………………. 5.“We shall overcome this difficulty”, they said. ………………………………………………….. 6.“My father is a doctor here”, my friend said. ……………………………………………………. 7.“I am going on holiday tomorrow”, the boy said to his neighbor. ………………………………………………………………………………………………………. 8.“You will have to finish all these exercises before next week”, the teacher said to his students. ………………………………………………………………………………………………………. 9.“I came back here early yesterday,” she said. ……………………………………………………. 10.“I’ve broken the vase,” she said. ………………………………………………………. 11.“I will never see you again,” the boy said to the girl. ………………………………………………………………………………………………………. 12.He said to her, “You are my friend.” ………………………………………………………. 13.Johnny said to his mother, “I don’t know how to do this exercise.” ………………………………………………………………………………………………………. 14.“We are waiting for the school bus”, said the children. ………………………………………………………………………………………………………. 15.Mary said, “My father died a year ago”. ………………………………………………………
N:Hi Tom._________ T: I'm fine__________ N:Oh I've done my homework T: _____________________________ N: Oh my got ! That exercise is very easy T:________________________ N:I think we'll have our first music class tomorrow. T:Thanks N___________________________
bạn nào lớp 9 giúp mình soạn bài Unit 1 " A Visit from a pen pal" với nha ! notcoppy nhé
1.She said, “I can’t find my umbrella”. ……………………………………………………… 2.They said, “We are learning English now”. ………………………………………………………………………………………………………. 3.“My friend is coming next week”, Tom said. ……………………………………………………. 4.“I’ll help my mum with housework this weekend” he said. ………………………………………………………………………………………………………. 5.“We shall overcome this difficulty”, they said. ………………………………………………….. 6.“My father is a doctor here”, my friend said. ……………………………………………………. 7.“I am going on holiday tomorrow”, the boy said to his neighbor. ………………………………………………………………………………………………………. 8.“You will have to finish all these exercises before next week”, the teacher said to his students. ………………………………………………………………………………………………………. 9.“I came back here early yesterday,” she said. ……………………………………………………. 10.“I’ve broken the vase,” she said. ………………………………………………………. 11.“I will never see you again,” the boy said to the girl. ………………………………………………………………………………………………………. 12.He said to her, “You are my friend.” ………………………………………………………. 13.Johnny said to his mother, “I don’t know how to do this exercise.” ………………………………………………………………………………………………………. 14.“We are waiting for the school bus”, said the children. ………………………………………………………………………………………………………. 15.Mary said, “My father died a year ago”. ……………………………………………………….
M.n cho em hỏi các dạng Toán Đại và Hình lớp 7 để em xem trước với ạ.
Phân tích thành nhân tử: 6x^2.y^2 - (X^2 +4y^2-1)^2
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