用简便方法计算:(-1000)×(3/10-1/2+1/5-0.1)
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用简便方法计算:(-1000)×(3/10-1/2+1/5-0.1)
用简便方法计算:(-1000)×(3/10-1/2+1/5-0.1)
用简便方法计算:(-1000)×(3/10-1/2+1/5-0.1)
(-1000)×(3/10-1/2+1/5-0.1)
=(-1000)×3/10-(-1000)×1/2+(-1000)×1/5-(-1000)×0.1
=-300+500-200+100
=100