Giải giùm mk nhữg bài có đánh dấu x
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Những câu hỏi liên quan
Bài 1Tìm số nguyên x thỏa mãn: x+( x+1)+(x+2)+....+19+20=20
Bài 2 tìm N€Z biết
-7×N chia hết N-3
-N+11chia hết N-1
-2×n chia hết n-2
Dấu € là dấu thuộc nha , các bạn giải nhanh giùm mk với , mk đã gửi 2 lần rùi nhưng ko có ai trả lời cả
Bài 1:
x+(x+1)+...+19+20=20
=>x+(x+1)+...+19=20-20=0
=> (x+19) + (x+1+18) +...+(x +18+1) + 0=0
=>(x+19)+(x+19)+...+(x+19)+0=0
=>x + 19 = 0
=>x = -19
bài 2 (lớp 7 có thể thay x thành . )
* 7.N chia hết cho N-3
=> 7.N - 21 + 21 chia hết cho N-3
=> 7.N - 3.7 + 21 chia hết cho N-3
=> 7. (N-3) + 21 chia hết cho N-3
mà 7. ( N-3) chia hết cho N-3
=> 21 chia hết cho N-3
=> N-3 thuộc Ư(21)
=>N -3 = 1 ;3 ;7;21;-1;-3;-7;-21
=>N = 4;6;10;24;2;0;-4;-18
*n +11 chia hết cho n-1
=>n - 1 +11 +1 chia hết cho n-1
=> n-1 +12 chia hết cho n-1
=> 12 chia hết cho n-1
=>n-1 thuộc Ư(12)
=> n -1 = 1;2;3;4;6;12;-1;-2;-3;-4;-6;-12
=>n-1= 2;3;4;5;7;13;0;-1;-2;-3;-5;-11
*2.n chia hết n-2
=> 2.n - 4 + 4 chia hết n-2
=> 2n - 2.2 +4 chia hết n-2
=> 2(n-2) + 4 chia hết n-2
mà 2(n-2) chia hết n-2
=> 4 chia hết n-2
=> n - 2 thuộc Ư(4)
=> n - 2 = 1;2;4;-1;-2;-4
=> n = 3 ; 4;5;1;0;-2
*học tốt*
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Tìm x: (bài này trong đề thi của mikđo giải giùm nhe mà phải đúng nữa . Thanks ) 2x+4 + 2x = 34
Bạn Trâm đánh dấu các số trang từ 1 -> 100. Hỏi cần bao nhiêu chữ số để đánh hết số trang ?
(=) 2x.24+2x=34
(=) 2x.(16+1)=34
(=) 2x.17 =34
(=) 2x =2
=) x = 1
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Các số từ 1 đến 9 có 9 chữ số.
Các số từ 10 đến 99 có 90 số và có số chữ số là: 90 x 2 = 180 chữ số
Số 100 có 3 chữ số nên sẽ cần số chữ số là: 9 + 180 + 3 = 192 chữ số
Đáp số: 192 chữ số
Chúc bạn học tốt!
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giải hộ mk các bài đánh dấu vs ạ.mk cần gấp.mk cám ơn
Bt1 Cho /x/ =7, /y/=20. Tính x-y
Dấu / là dấu giá trị tuyệt đối nha , giải nhanh giùm mk với
|x| = 7 <=> x=7 hoặc x=-7
|y|= 20 <=> y=20 hoặc y=-20.
Với x=7 và y=20, ta có x-y = 7-20 = -13
Với x=-7 và y=20, ta có x-y = -7-20 = -27
Với x=7 và y=-20, ta có x-y = 7-(-20) = 27
Với x=-7 và y=-20, ta có x-y = -7-(-20) = 13.
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cha mua cho em quyển sách dày 265 trang. em đánh dấu các số từ 1 -> 256. hỏi em phải đánh dấu bao nhiêu chữ số
giải chi tiết giùm mình nha ! cảm ơn
sồ trang từ 1->9 có tổng cộng 9 chữ số
số các số từ 10->99 là (99-10):1+1=90 (số)
số trang từ 10->99 có tổng cộng 90 nhân 2 = 180 chữ số
số các số từ 100 ->265 là (265-100):1+1=166 (số)
số trang từ 100->265 có tổng cộng 166 nhân 3 = 498 chữ số
em phải đánh số chữ số là : 9+180+498=587 chữ số
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Konnichiwa mina. Lâu rồi mk ko lên, nên cg ko nhớ gì nhiều. À mk đăng cái bài này mong mina giải giùm mk. Bài mà mk cần mina giải giúp, đó là dạng tìm x. Đây là bài cần giải nè mina x x 72,2 - x x 62,2 = 201,6. Kết quả mk cho rồi nhưng mk ko biết cách làm, giúp mk nha. Arigator mina nhìu nhìu lém lém.
X x 72,2 - X x 62,2 = 201,6
X x ( 72,2 -62,2 ) = 201,6
X x 10 = 201,6
X = 201,6 : 10
X = 20,16
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Bn ơi bn làm như thế nào nào mà mk ko hiểu tí nào cả. Lúc đầu kết quả là 201,6 nhưng đến sau cùng thì kết qur là 20,16 là như thế nào vậy.
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Bài 5: Đánh dấu (√ ) trước những câu trả lời đúng. Đánh dấu (X) trước những câu có lỗi sai và sửa lại cho đúng._____________________________________________________________________________________________________________________ 1. The special effects of this film are fascinated.2. I embarrassed today morning because I wore my sweater inside out.3. Everyone in my class found the lesson very bored.4. The locals were extremely welcoming.5. My brother is not a bored person...
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Bài 5: Đánh dấu (√ ) trước những câu trả lời đúng. Đánh dấu (X) trước những câu có lỗi sai và sửa lại cho đúng.
_____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________
| 1. The special effects of this film are fascinated. 2. I embarrassed today morning because I wore my sweater inside out. 3. Everyone in my class found the lesson very bored. 4. The locals were extremely welcoming. 5. My brother is not a bored person. 6. Many critics found this film was deeply moving. 7. I am confusing by these twins. 8. No one was surprised at the news. |
1. fascinated => fascinating
2. I was embarrassed .....
3. bored => boring
4. welcoming => welcomed
5. bored => boring
6. was => bỏ
7. confusing => confused
8. Đ
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Cho hàm số y = 3x
a) Vẽ đồ thị của hàm số trên .
b) Đánh dấu điểm B trên đồ thị có hoành độ bằng 2.
giải chi tiết giùm nha! PLEASE!
Tìm x
14:(2.x+3)
: ở trên là dấu chia nha mn do k có dấu chia hết nên mik viết dấu chia(mik đã bik đáp án nhưng mik cần cách giải,mn viết cách giải giùm mik nhé!!!Mơn mn)