-1.53×0.75+2.53×3/4-0.2×7.5
=-1.53×0.75+2.53×0.75-2×0.75
=0.75×(-1.53+2.53-2)
=0.75×(-1)
=-0.75
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-1.53×0.75+2.53×3/4-0.2×7.5
=-1.53×0.75+2.53×0.75-2×0.75
=0.75×(-1.53+2.53-2)
=0.75×(-1)
=-0.75