3^2+3^3+3^4=?
50+70+90+30+10=?
1000+250+900+300+700+100+750
Find two natural numbers that are 12 times as big as your number and the number of those two numbers is twice your number.
18.3+25.3+3.7=?
Prove that abcabc divide by 7,11,13
Ưcln(10;20;40)=?
A=1+2+3+...+49+50=?
S=1+3+3^2+..+3^50=?
How many different letters are there in the following word? Answer: There are ............. different letters.
CMR:
8^7-2^18 chia hết cho 14
