1, How many

2, How much

3, How much

4, How many

5, How many

6, How many

7, How many

8, How much

1, How many subjects do you study at school?

2, How many hours do you sleep every night?

3, How much money do you have in your bag or pocket?

4, How much water do you drink every day?

5, How many students in your class?

b, /x - 2/ \(\le\)1

=> x - 2 ϵ {1;0;-1}

=> \(\left[\begin{array}{nghiempt}x-2=1\\x-2=0\\x-2=-1\end{array}\right.\)

=>\(\left[\begin{array}{nghiempt}x=1+2=3\\x=0+2=2\\x=-1+2=1\end{array}\right.\)

=> x ϵ {3;2;1}

a, /(x - 3).(x + 2)/ = 0

=> (x - 3) . (x + 2) = 0

=> \(\left[\begin{array}{nghiempt}x-3=0\\x+2=0\end{array}\right.\)

=> \(\left[\begin{array}{nghiempt}x=0+3=3\\x=0-2=-2\end{array}\right.\)

=> x ϵ {3;-2}

A = 5⁰ + 5¹ + 5² + ... + 5²⁰⁶

A = (5⁰ + 5¹ + 5²) + ... + (5²⁰⁴+5²⁰⁵+5²⁰⁶)

A = 5(1+5+25) + 5³(1+5+25) + ... + 5²⁰⁴(1+5+25)

A= 5 . 31 + 5³ . 31 + ... + 5²⁰⁴ . 31

A = 31(5+5³+...+5²⁰⁴)

=> A \(⋮\)31

Chiều rộng HCN ban đầu là: (31 - 1x1) : 5 x 2 = 12m

Chiều dài HCN ban đầu là: 12 x 1,5 = 18m

Diện tích HCN đó là: 18 x 12 = 216m2

5x + 2x = 91
7x = 91
x = 91 : 7 = 13

4^x-3 = 256
4^x-3 = 4⁴
=> x - 3 = 4
=> x = 7

Hai câu sau không rõ, xin mời viết rõ ràng hơn
 

= -15 + 27 + 1 x 1

= -15 + 27 + 1

= 13

0,126                                                 

a, Yes, I am / No, I'm not

b, No, I'm not

c, Yes, I’d love to / I'm sorry, I can't

d, Yes, we should / No, we shouldn't

e, Yes, I am / No, I'm not