1.25ⅹ0.15+1.23ⅹ0.85
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1.25×0.15+1.23×0.85
=1.25×0.15+(1.25-0.02)×0.85
=1.25×0.15+1.25×0.85-0.02×0.85
=1.25×(0.15+0.85)-0.02×0.85
=1.25×1-0.017
=1.25-0.017
=1.233
=1.25×0.15+(1.25-0.02)×0.85
=1.25×0.15+1.25×0.85-0.02×0.85
=1.25×(0.15+0.85)-0.02×0.85
=1.25×1-0.017
=1.25-0.017
=1.233
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