Question

用5，7，2，1，哇"凑24"游戏，可以组成的算式是( )或( )？

Answer 1

((5+7)*2)/1
(5+7)*(2/1)
((5+7)*2)*1
(5+7)*(2*1)
(5*(7-2))-1
(5+7)/(1/2)
((5+7)/1)*2
(5+(7/1))*2
((5+7)*1)*2
(5+(7*1))*2
(5+7)*(1*2)
(5-2)*(7+1)
(5-2)*(1+7)
(5+(1*7))*2
((5/1)+7)*2
((5*1)+7)*2
((7+5)*2)/1
(7+5)*(2/1)
((7+5)*2)*1
(7+5)*(2*1)
(7+5)/(1/2)
((7+5)/1)*2
(7+(5/1))*2
((7+5)*1)*2
(7+(5*1))*2
(7+5)*(1*2)
((7-2)*5)-1
(7+1)*(5-2)
(7+(1*5))*2
((7/1)+5)*2
((7*1)+5)*2
2*((5+7)/1)
(2*(5+7))/1
2*(5+(7/1))
2*((5+7)*1)
(2*(5+7))*1
2*(5+(7*1))
2*(5+(1*7))
2*((5/1)+7)
2*((5*1)+7)
2*((7+5)/1)
(2*(7+5))/1
2*(7+(5/1))
2*((7+5)*1)
(2*(7+5))*1
2*(7+(5*1))
2*(7+(1*5))
2*((7/1)+5)
2*((7*1)+5)
2/(1/(5+7))
(2/1)*(5+7)
2*((1*5)+7)
2*(1*(5+7))
(2*1)*(5+7)
2/(1/(7+5))
(2/1)*(7+5)
2*((1*7)+5)
2*(1*(7+5))
(2*1)*(7+5)
((1*5)+7)*2
1*((5+7)*2)
(1*(5+7))*2
(1+7)*(5-2)
((1*7)+5)*2
1*((7+5)*2)
(1*(7+5))*2
1*(2*(5+7))
(1*2)*(5+7)
1*(2*(7+5))
(1*2)*(7+5)

Answer 2

（7+1）×（5-2）
=8×3
=24
（7+5）×2×1
=12×2×1
=24×1
=24

Answer 3

上面两位回答都对。