có 20 chu so1
20 so2
.........
20chu so 9
Ta co 1.20+2.20+...+9.20
=20+40+60+80+100+120+140+160+180
=(20+180)+(40+160)+(60+140)+(80+120)+100
=20.4+100
=900
If the sum of all digits in a whole number is 14 , find the smallest such number ?
a) find the next two term in the sequence: 1; 4; 9; 16; 25;....;.....;
Answer:
b) find the smallest two-digit number whose number is 7 times the sum of its digits?
Answer:
The sum of the digits of a ten-digit number is epual to 9.What is the product of the digits of this number?
John wrote a 3-digits number on a piece of a paper and asked Peter to guess it. Peter asked:"Is the number 173 ?".John replied:"One of the digits is correct, the position of that difiy is also correct". Peter asked again:"Is the number 123 ?". Two digits are correct, but the position of those digits are wrong." Peter asked again:"Is the number 324 ?". All three are correct , but the digits are all in the wrong places." What is the number written by John ?
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The sum of the first and the second number is 5.52. The sum of the second and the third number is 12.25. The sum of the third and the first number is 11.63. Find the first number.
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