serious math. good math people needed?

0 ⤊

serious math. good math people needed?

okay i was just messin around in school and i was taking my sisters date of birth (1994) and you can't do less or more. you can divide , subtract, square root, on and on and you have to make 1-20 just using 1 9 9 and 4. its sorta hard i can't figure out 7, 13, 18, and 19.

plz help

2007-09-09 13:16:51 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

IN ORDER please

2007-09-09 13:34:31 · update #1

2 answers

7 = 9 - (9-1)/4
18 = 1 + 9 + (√4)^(√9)
13 = (9 - 1) + √4 + √9
19 = (9 - 1)√4 + √9

2007-09-09 13:30:14 · answer #1 · answered by Philo 7 · 0⤊ 0⤋

7: 9 - â9 + â4 - 1

13: 9 + 9 - 1 - 4

18: (9 + 9) / (â4 - 1)

19: 9 + 9 + â4 - 1

2007-09-11 13:00:52 · answer #2 · answered by xiao 2 · 0⤊ 0⤋