Petter has 24 $ .Each book is 3 $ .How many books does he can buy?
K
Khách
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LN
9 tháng 8 2017
1.how does you spell you name?->..........do.............?
2.He brother and her sister is in the yard.->............are ...........?
3.how many floor does your school has?->..........floors..............?
4.what do your brother doing?->..............is.................?
5.how many books is there on these bookshelf?->..........are.........?
9 tháng 8 2017
Each sentence has one mistake.Find and correct it:
1.how does you spell you name?->..........do...........?
2.He brother and her sister is in the yard.->.........are............?
3.how many floor does your school has?->............floors............?
4.what do your brother doing?->...............is................?
5.how many books is there on these bookshelf?->..........are.........?
AH
Akai Haruma
Giáo viên
2 tháng 3 2018
Lời giải:
Gọi số sách mà Clara đã mua là $a$ và số tạp chí đã mua là $b$ (\(a,b\in\mathbb{N}^*\) )
Theo bài ra ta có: \(3,4a+1,6b=23\)
\(\Rightarrow 3,4a=23-1,6b\leq 23-1,6.1\) do \(b\geq 1\)
hay \(3,4a\leq 21,4\Rightarrow a\leq \frac{21,4}{3,4}\Rightarrow a\leq 6\)
Vì \(a\in\mathbb{N}^*\Rightarrow a\in\left\{1;2;3;4;5;6\right\}\)
Nếu \(a=1\Rightarrow b=\frac{23-3,4}{1,6}=\frac{49}{4}\not\in\mathbb{N}^*\) (loại)
Nếu \(a=2\Rightarrow b=\frac{23-3,4.2}{1,6}=\frac{81}{8}\not\in\mathbb{N}^*\) (loại)
Nếu \(a=3\Rightarrow b=\frac{23-3,4.3}{1,6}=8\) (thỏa mãn)
Nếu \(a=4\Rightarrow b=\frac{23-3,4.4}{1,6}=\frac{47}{8}\not\in\mathbb{N}\) (loại)
Nếu \(a=5\Rightarrow b=\frac{23-3,4.5}{1,6}=\frac{15}{4}\not\in\mathbb{N}^*\) (loại)
Nếu \(a=6\Rightarrow b=\frac{23-3,4.6}{1,6}=\frac{13}{8}\not\in\mathbb{N}^*\) (loại )
Vậy Clara mua $3$ quyển sách và $8$ quyển tạp chí.
30 tháng 11 2021
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TD
23 tháng 10 2021
1.Hi. My name is John. What’s__________name? -My name’s Lan.
A. my B. her C. his D. your
2.How many books does Ba___________? - He has eight.
A. have B. has C. to have D. having
3.Does Lan have Math on Tuesday? - No, she___________.
A. don’t B. doesn’t C. hasn’t D. haven’t
4.She ______ her teeth every evening. A. brush B. to brush C. brushing D. brushes
5.What is she doing ? she _____ to music A.listen B.listens C.is listening D.listening
6.He has breakfast _____ six o’clock. A. in B. at C. on D.for
7.My school is ________ to a hospital.A. near B. next C. beside D. between
8.Where is _____ school? - It’s in the country.A.Nams’ B. Nam C.the Nam’s D. Nam’s
eight book ( 8)
nếu thật là 8 vậy bạn k cho minh rồi mình k cho