(1)(-8)-(-1) =-8+1 =-7 (2)45+(-30) =45-30 =15 (3)(-1.5)-(-11.5) =-1.5+11.5 =10 (4)(-1/4)-(-1/2) =-1/4+1/2 =1/4 (6)(-40)-28-(-19)+(-24) =-40-28+29-24 =-63 (7)22.54+(-4.4)+(-12.54)+4.4 =22.54-4.4-12.54+4.4 =0 (9)2.4-(-3/5)+(-3.1)。
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