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HP
0
XO
30 tháng 4 2021
Ta có :\(\frac{x-5}{100}+\frac{x-4}{101}+\frac{x-3}{102}=\frac{x-100}{5}+\frac{x-101}{4}+\frac{x-102}{3}\)
<=> \(\left(\frac{x-5}{100}-1\right)+\left(\frac{x-4}{101}-1\right)+\left(\frac{x-3}{102}-1\right)=\left(\frac{x-100}{5}-1\right)+\left(\frac{x-101}{4}-1\right)+\left(\frac{x-102}{3}-1\right)\)
<=> \(\frac{x-105}{100}+\frac{x-105}{101}+\frac{x-105}{102}=\frac{x-105}{5}+\frac{x-105}{4}+\frac{x-105}{3}\)
<=> \(\left(x-105\right)\left(\frac{1}{100}+\frac{1}{101}+\frac{1}{102}\right)=\left(x-105\right)\left(\frac{1}{5}+\frac{1}{4}+\frac{1}{3}\right)\)
<=> \(\left(x-105\right)\left(\frac{1}{100}+\frac{1}{101}+\frac{1}{102}-\frac{1}{5}-\frac{1}{4}-\frac{1}{3}\right)=0\)
<=> x - 105 = 0 (Vì \(\frac{1}{100}+\frac{1}{101}+\frac{1}{102}-\frac{1}{5}-\frac{1}{4}-\frac{1}{3}\ne0\))
<=> x = 105
Vậy nghiệm phương trình là x = 105
TH
2
DT
Đỗ Thanh Hải
CTVVIP
27 tháng 4 2021
Hai bài đâu là bài nghe nên bỏ qua nhé
III
1 A
2 B
3 C
4 C
5 C
6 D
7 B
8 B
9 C
10 C
11 B
12 B
13 D
14 D
15 C
16 B
17 A
18 D
19 A
20 B
21 C
DT
Đỗ Thanh Hải
CTVVIP
27 tháng 4 2021
IV
1 Will teacher be replaced by robots in the future?
2 Nam said he wanted to be a robot designer
3 May said she hoped she would be in a city out at the sea
4 Linda said she overslept that morning
5 Anti-ageing pills will be invented to help people live longer
6 The contaminated results in people's health
7 If the factory doesn't treat its waste well, there will be serious water pollution
8 Five houses in a village in the easstern region were buried by the mudslide
9 Peter asked Mary if she wanted to travel to space one day
1 she went to university so as to study engineering
2 if he had prepared for the interview, he would have got the job
3 nam is study the best in my class
4 if i had enough money, i could buy this car
5 it was not until 199 that she became a teacher
6 A new house are going to be built this month
7 when are you listen to music to relax ?
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