2: 1*3*2*4=24
3: 4*( 1+2+3)=24
1: 2*(4+3+5)=24
2:4*(3+5-2)=24
1: (3+5-4)*6=24
1: (6-4)*(5+7)=24
1:(9+11)/10 *12 = 24
2:10-9+11+12 = 24
1:10+12-11+1;
솔루션:
①(a-b)×(c+d) 예 (10-4)×(2+2)=24 등.
② (a+b) ÷ c × d as (10+2) ÷ 2 × 4 = 24 등.
③(a-b÷c)×d (예: (3-2÷2)× 12=24 등.
④(a+b-c)×d 예 (9+5-2)×2=24 등.
⑤a×b+c-d 예:11× 3+1-10 = 24 등.
⑥(a-b)×c+d 예 (4- 1)×6+6=24 등.