3/4+2.875-2又3/8-0.75等于多少?
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3/4+2.875-2又3/8-0.75
=0.75+2.875-2.375-0.75
=0.75-0.75+(2.875-2.375)
=0+0.5
=0.5
=0.75+2.875-2.375-0.75
=0.75-0.75+(2.875-2.375)
=0+0.5
=0.5
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将所有的数统一化为小数再计算比较好,即原式=0.75+2.875-2.375-0.75=0.5。
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3/4+2.875-2又3/8-0.75
=3/4+2.875-19/8-0.75
=6/8-19/8+2.875-0.75
=-13/8+2.875-0.75
=-1.625-0.75+2.875
=-2.375+2.875
=0.5
=3/4+2.875-19/8-0.75
=6/8-19/8+2.875-0.75
=-13/8+2.875-0.75
=-1.625-0.75+2.875
=-2.375+2.875
=0.5
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