\(\frac{1}{2}+\frac{3}{2}+\frac{5}{2}=\frac{1+3+5}{2}=\frac{9}{2}\)

50+100=150t k cho tớ nha

1. the sun always (rise) rises in the east.look,it (rise) is rising!

2. i don't think i (go) will go out tonight.i'm too tired

3.where did you (spend) spend your summer holiday last year,tam?

4.in my country ,it (not rain) doesn't rain much in witer

5.let's wait for lien (arrive) to arrive and we (have) will have dinner

6.the moon (move)moves around the earth

7.mai (be) was very happy when she (receive) received a letter from her sister this morning .

8.would you like (join) to join my class next sunday ?we (visit) will visit the local museum

 1-1+2-1

=0+1

=1

                                         \(3^{x+1}=9^x\)

                                           \(3^{x+1}=\left(3^2\right)^x\)

                                            \(\Rightarrow3^{x+1}=3^{2x}\)

                                           \(\Rightarrow x+1=2x\)

                                         \(\Rightarrow1=2x-x=x\)

                                        \(\Rightarrow x=1\)

                                           Ủng hộ mk nha!!

Số số hạng là :

19 - 1 + 1 = 19 ( số hạng )

Tổng trên là :

( 1 + 19 ) x 19 : 2 = 190

Vậy tổng trên là : 190

Click mik , mik click lại !!!!!!!!!!!!!!!!!!!!!!!!

Ngu nguoi

mk nhầm chút, chữ số thứ 50 của dãy là : chữ số 8 của số 80

\(\frac{2^{19}.27^3+15.4^9.9^4}{6^9.2^{10}+12^{10}}=\frac{2^{19}.\left(3^3\right)^3+3.5.\left(2^2\right)^9.\left(3^2\right)^4}{\left(2.3\right)^9.2^{10}+\left(2^2.3\right)^{10}}\)

\(=\frac{2^{19}.3^9+3.5.2^{18}.3^8}{2^9.3^9.2^{10}+2^{20}.3^{10}}\)

\(=\frac{2^{18}.3^8.\left(2.3+3.5\right)}{2^{18}.3^9.\left(2+2^2.3\right)}\)

\(=\frac{6+15}{3.\left(2+12\right)}\)

\(=\frac{21}{3.14}=\frac{21}{42}=\frac{1}{2}\)

0,1,4,5,6,9 100%luôn