x+\(\frac{1}{2}\) .x-25%.x=10
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(x+1)+(x+2)+(x+3)+...+(x+30)=795
<=> (x+x+x+...+x)+(1+2+3+...+30)=795
<=> 30x+[(30+1) x 30:2]=795
<=> 30x+465=795
<=> 30x=330
<=> x=11
Ta có : ( x + 1 ) + ( x + 2 ) + ... + ( x + 30 ) = 795
<=> ( x + x + x +... + x ) + ( 1 + 2 + ... + 30 ) = 795
<=> 30.x + 465 = 795
<=> 30 .x = 795- 465
<=> 30 . x = 330
<=> x = 330 : 30
<=> x = 11
Vậy x = 11


So so hang cua tong do la :(98-10):2+1=45 (so hang)
Tong cac so chan co hai chu so la :(98+10).45:2=2430
D/S:2430.
Số chẵn đầu tiên có 2 chữ số là 10
Số chẵn cuối cùng có 2 chữ số là 98
Số số hạng số chẵn có 2 chữ số là:
(98-10):2 +1=45(số số hạng)
=> Tổng số chẵn có 2 chữ số là:
\(\frac{\left(98+10\right)45}{2}=2430\)

Tìm x
2.(x - 3) - 3 = 4.(3 + x) - 18
2x - 6 - 3 = 12 + 4x - 18
- 6 - 3 - 12 + 18 = 4x - 2x
-3=2x
\(\frac{-3}{2}\)=x
Vậy x=\(-\frac{3}{2}\)
125 - 39 x + 3 = 65
39 x + 3 = 125 - 65
39 x + 3 = 60
39 x = 60 - 3
39 x = 57
x = \(\frac{19}{13}\)
Vậy x=\(\frac{19}{13}\)

1. I don't want to eat anything because I am not hungry
2. How much beef do you want ?
3. Thuy and her friends are skipping rope now
4. Phong goes fishing three times a week
5. There is a garden behind the/our/my school
1,I DONT WANT EAT ANYTHING BECAUSE I,M NOT HUNGRRY
2,HOW MUCH BEEF DO YOU WANT
3,Thuy and her friends are skipping rope now
4,Phong goes fishing three times a week
5, There is a garden behind my/our my school
quá dễ vậy mà cũng kg biết làm

EX1: 1. Much more serious
2. Much bigger
3. Much more complicated
4. A bit happier
5. Slightly older
EX2: 1. Longer
2. No cheaper
3. No worse
EX3: 1. Harder and harder
2. Bigger and bigger
3. Heavier and heavier
4. More and more nervous
5. Worse and worse
6. more and more expensive
7. More and more talkative
8. Better and better
EX4: 1. The better feeling
2. The harder concentration
3. The more impatient becoming
EX5: 1.The earlier we live, the sooner we'll arrive
2. The longer he waited, the more impatient he became
3. The more I got to know him, the more I him
4. The more you practise your E, the faster you learn
5. The longer the phone call, the more you have to pay
6. The more goods you sell, the more profit you make
"Xin lỗi nhưng bài 2 với bài 4 tớ không rõ lắm"
Bài làm:
Đề ra = x +1/2 .x - 0,25 .x =10
=> x .( 1 +1/2 -0,25) =10
=> 1,25 .x =10
=> x = 10 :1,25
=> x =8
#Chúc bạn học tốt :))
x+1/2x-25%x=10
<=>x(1+1/2-1/4)=10
<=>x.5/4=10
<=>x=8
Vậy x=8