4.6×0.25加上0.25×1.7再加上6.3再乘以0.75,怎么写？
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4.6×0.25+0.25×1.7+6.3×0.75
=0.25×（4.6+1.7）+6.3×0.75
=0.25×6.3+0.75×6.3
=（0.25+0.75）×6.3
=1×6.3
=6.3
=0.25×（4.6+1.7）+6.3×0.75
=0.25×6.3+0.75×6.3
=（0.25+0.75）×6.3
=1×6.3
=6.3
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