算法多多,举例如下:(7+1+4-6)×4=24
((1+7)-4)*6(1+(7-4))*64/((7/6)-1)6*(1-(4-7))6*((1-4)+7)6*((1+7)-4)6*(1+(7-4))6*((7+1)-4)6*(7+(1-4))6*(7-(4-1))6*((7-4)+1)((7+1)-4)*6(7+(1-4))*6(7-(4-1))*6((7-4)+1)*6