1.A(long->often)

2.B(buyed->bought)

3.A(was->were?)

4.D(our->ours)

5.B?(so->but)

Ta có:

100A=\(\dfrac{100^{2022}+100}{100^{2022}+1}\); 100B=\(\dfrac{100^{2021}+100}{100^{2021}+1}\)

100A=\(\dfrac{100^{2022}+1+99}{100^{2022}+1}\); 100B=\(\dfrac{100^{2021}+1+99}{100^{2021}+1}\)

100A=1+\(\dfrac{99}{100^{2022}+1}\);100B=1+\(\dfrac{99}{100^{2021}+1}\)

Ta có:\(100^{2022}+1\)>\(100^{2021}+1\)

=>\(\dfrac{99}{100^{2022}+1}\)<\(\dfrac{99}{100^{2021}+1}\)

=>\(\dfrac{100^{2022}+100}{100^{2022}+1}\)<\(\dfrac{100^{2021}+100}{100^{2021}+1}\)

=>100A<100B

=>A<B

C

11.A

12.C

13.C

14.B

15.C

16.A

17.A

18.B

19.D

20.C

A

a.(33,7-31,5)+(57,6-55,4)

=2,2+2,2

=4,4

b.(85,5+4,5)-(12,02+7,98)

=90-20

=70

c.(15,25+3,75).4+(20,71+5,29).5

=19.4+26.5

=76+130

=206

d.(34,72+32,28):5-(57,25-36,05):2

=67:5-21,2:2

=11,4-10,6

=0,8

Veston

2/3 của 90 là:

90 x 2/3=60

3/5 của 100 là:

100 x 3/5= 60

15/100 của 8000 là:

8000 x 15/100=1200