Choose + - x division or bracket to write 1,2,7,9 into a formula, the result is 24, the formula is?
2×9+(7-1)=24
Use + - × △ brackets and four numbers 3.4.7.1 to form a formula, so that the result is 24. List the formula
Use + - × △ brackets and four numbers 3.4.7.1 to form a formula, so that the result is 24. List the formula
4-7-3-1 = 24
Math problem: 3 x 3 ^ 2 x 3 ^ 3 x 3 ^ 4 x X 3 ^ n=
S=3(1-3^n)/(1-3)=3(3^n-1)/2