哪题
(3) (-0.6)+1.7+(0.6)+(-1.7)+(-9) = -0.6+1.7+0.6-1.7-9 = 1.1+0.6-1.7-9 = 1.7-1.7-9 = -9 (5) -3-4+19-11+2 = -7+19-11+2 = 12-11+2 = 1+2 = 3
哪个啊
