- Chiếc pizza đầu tiên xuất hiện tại Napoli của nước Ý.

\(3769-684:\left(160-141\right)\times36\)

\(=3769-684:19\times36\)

\(=3769-36\times36\)

\(=3769-1296\)

\(=2473\)

Chúc bạn học tốt

1.Tính:

a) \(6^2:4.3+2.5^2\)

\(=36:4.3+2.25\)

\(=9.3+50\)

\(=27+50\)

\(=77\)

b) \(5.4^2-32:4^2\)

\(=5.16-32:16\)

\(=80-2\)

\(=78\)

c) \(80-\left(4.5^2-3.2^3\right)\)

\(=80-\left(4.25-3.8\right)\)

\(=80-\left(100-24\right)\)

\(=80-76\)

\(=4\)

d) \(2448:\left[119-\left(23-6\right)\right]\)

\(=2448:\left[119-17\right]\)

\(=2448:102\)

\(=24\)

e) \(23.85+15.23+170\)

\(=23\left(85+15\right)+170\)

\(=23.100+170\)

\(=2300+170\)

\(=2470\)

f) \(3^3.2-5.2023^0+36:3^2\)

\(=27.2-5.1+36:9\)

\(=54-5+4\)

\(=53\)

2. Tìm x biết:

a) \(123-5.\left(x+4\right)=38\)

\(=>5.\left(x+4\right)=123-38\)

\(=>5.\left(x+4\right)=85\)

\(=>x+4=85:5\)

\(=>x+4=17\)

\(=>x=17-4\)

\(=>x=13\)

b) \(\left(3.x-2^4\right).7^3=2.7^4\)

\(=>3.x-2^4=2.7^4:7^3\)

\(=>3.x-2^4=2.7\)

\(=>3.x-16=14\)

\(=>3.x=14+16\)

\(=>3.x=30\)

\(=>x=30:3\)

\(=>x=10\)

c) \(\left(2600+6400\right)-3.x=1200\)

\(=>9000-3.x=1200\)

\(=>3.x=9000-1200\)

\(=>3.x=7800\)

\(=>x=7800:3\)

\(=>x=2600\)

d) \(\left[\left(6.x-72\right):2-84\right].28=5628\)

\(=>\left(6.x-72\right):2-84=5628:28\)

\(=>\left(6.x-72\right):2-84=201\)

\(=>\left(6.x-72\right):2=201+84\)

\(=>\left(6.x-72\right):2=285\)

\(=>6.x-72=285\times2\)

\(=>6.x-72=570\)

\(=>6.x=570+72\)

\(=>6.x=642\)

\(=>x=642:6\)

\(=>x=107\)

e) \(70-5.\left(x-3\right)=45\)

\(=>5.\left(x-3\right)=70-45\)

\(=>5.\left(x-3\right)=25\)

\(=>x-3=25:5\)

\(=>x-3=5\)

\(=>x=5+3\)

\(=>x=8\)

f) \(10+2.x=4^7:4^5\)

\(=>10+2.x=4^2\)

\(=>10+2.x=16\)

\(=>2.x=16-10\)

\(=>2.x=6\)

\(=>x=6:2\)

\(=>x=3\)

g) \(2.x-138=2^3.3^2\)

\(=>2.x-138=8.9\)

\(=>2.x-138=72\)

\(=>2.x=72+138\)

\(=>2.x=210\)

\(=>x=210:2\)

\(=>x=105\)

h) \(231-\left(x-6\right)=1339:13\)

\(=>231-\left(x-6\right)=103\)

\(=>x-6=231-103\)

\(=>x-6=128\)

\(=>x=128+6\)

\(=>x=134\)

Chúc bạn học tốt

cảm ơn chị. Em nhầm

1. never does

2. Does your mother like

3. chat

4. goes

5. is

6.are

7. am not

8. Are

9. Is

10. Is

Chúc bạn học tốt

\(4\left(3x+4\right)-5=23\)

\(=>4\left(3x+4\right)=23+5\)

\(=>4\left(3x+4\right)=28\)

\(=>3x+4=28:4\)

\(=>3x+4=7\)

\(=>3x=7-4\)

\(=>3x=3\)

\(=>x=3:3\)

\(=>x=1\)

Chúc bạn học tốt

1. large >< small                          2. quiet >< noisy

3. good >< bad                             4. high >< low, short

5. far >< near

a) C = \(\left\{2;4;6\right\}\)

b) B= \(\left\{5;7;9\right\}\)

c) E = \(\left\{1;2;3;4;5;6;7;9\right\}\)

d) F = \(\left\{1;2;3;4;5;6;7;9\right\}\)

e) A = \(\left\{4;7\right\}\)

    T = \(\left\{6;9\right\}\)

    H = \(\left\{4;9\right\}\)

Chúc bạn học tốt

ờm... không chắc lắm!