用2,-4,12,1这4结果等于24,怎样计算?

问题描述:

用2,-4,12,1这4结果等于24,怎样计算?

(12-4)乘以(1+2)

(12+(-4))*(2+1)=24

(12-4)*(2+1)

(12-4)(1+2)

(2+1)*[12+(-4)]=24