0.75*1.6+1.4*0.75+7.5(简便运算)

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0.75*1.6+1.4*0.75+7.5(简便运算)
0.75*1.6+1.4*0.75+7.5(简便运算)

0.75*1.6+1.4*0.75+7.5(简便运算)
0.75*1.6+1.4*0.75+7.5
=0.75(1.6+1.4)+7.5
=2.25+7.5
=9.75

.....................

0.75*1.6+1.4*0.75+7.5
=(1.6+1.4+10) x0.75
=13x0.75
=9.75

=0.75*(1.6+1.4+10)=0.75*(12+1)=9+0.75=9.75

0.75*1.6+1.4*0.75+7.5
=0.75x(1.6+1.4)+7.5
=0.75x3+7.5
=2.25+7.5
=9.75

0.75*1.6+1.4*0.75+7.5
=0.75*1.6+1.4*0.75+0.75x10
=0.75x(1.6+1.4+10)
=0.75x13
=9.75