Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions from 26 to 28.

This is the first time I have ever gone out for a picnic.

A. I have gone out for a picnic this time

B. I have ever gone out for a picnic

C. I have never gone out for a picnic before

D. I had never gone out for a picnic before

\(\dfrac{1}{12}\). \(\dfrac{37}{39}+\dfrac{1}{12}.\dfrac{2}{39}+\dfrac{1}{4}\)

=\(\dfrac{1}{12}.\left(\dfrac{37}{39}+\dfrac{2}{39}\right)+\dfrac{1}{4}\)

=\(\dfrac{1}{12}.1+\dfrac{1}{4}\)

=\(\dfrac{13}{12}+\dfrac{1}{4}\)

=\(\dfrac{16}{12}\)

Số chính phương không có tận cùng là 2,3,7,8

2+4+6+...+2x=210

=2(1+2+3+...+x)=210

=1+2+3+...+x=105

=x+1.x/2=105

(x+1)x=210

14.15=210

=>x=14

Vậy x=14

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