应该是：（7-3-1）×8=3×8=24
你好！1,一8,一7,3算出24的方法如下：((1+3)+-7)*-8(1+(3+-7))*-8((1+-7)+3)*-8(1+(-7+3))*-8((3+1)+-7)*-8(3+(1+-7))*-83/(1-(-7/-8))((3+-7)+1)*-8(3+(-7+1))*-8((-7+1)+3)*-8
8x（7-3-1）=24
