63×69.2/100+65×30.8/100
=63×69.2/100+65×(100-69.2)/100
=63×69.2/100-65×69.2/100+65
=(63-65)×69.2/100+65
=-2×69.2/100+65
=65-138.4/100
=65-1.384
=63.616
63×69.2/100+65×30.8/100
=63×69.2/100+65×(100-69.2)/100
=63×69.2/100-65×69.2/100+65
=(63-65)×69.2/100+65
=-2×69.2/100+65
=65-138.4/100
=65-1.384
=63.616
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