数学之美团为你解答(1又1/2 - 2又1/3 + 13/14) ×(-42)= [ (1 + 1/2) - (2+1/3) + (1 - 1/14) ] × (-42)= ( 1/2 - 1/3 - 1/14) ×(-42)= 1/2 ×(-42) - 1/3 ×(-42) - 1/14 ×(-42)= - 21 + 14 + 3= - 436×(29又17...