题目内容
(多种解法)计算:(-0.5)-(-3
)+2.75-(+7
)
解:解法一:原式=(-0.5)+(+3
)+2.75+(-7
)
=
=(3+2-7)+
=-2+0
=-2
解法二:原式=-0.5+3.25+2.75-7.5
=(-0.5+0.25+0.75-0.5)+(3+2-7)
=-2
=
=(3+2-7)+
=-2+0
=-2
解法二:原式=-0.5+3.25+2.75-7.5
=(-0.5+0.25+0.75-0.5)+(3+2-7)
=-2
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