计算下列各题 (-3.45)+(-12.5)+(+19.5)+(+3.45)+(-7.
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计算下列各题 (-3.45)+(-12.5)+(+19.5)+(+3.45)+(-7.
计算下列各题 (-3.45)+(-12.5)+(+19.5)+(+3.45)+(-7.
计算下列各题 (-3.45)+(-12.5)+(+19.5)+(+3.45)+(-7.
(-3.45)+(-12.5)+(+19.5)+(+3.45)+(-7.5) =-3.45-12.5+19.5+3.45-7.5 =-0.5