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0.64*1.2+0.63*0.2-0.12
=(0.63+0.01)*1.2+0.63*0.2-0.12
=0.63*1.2+0.01*1.2+0.63*0.2-0.12
=0.63*(1.2+0.2)+0.01*1.2-0.12
=0.63*1.4+0.012-0.12
=0.882+0.012-0.12
=0.894-0.12
=0.774
=(0.63+0.01)*1.2+0.63*0.2-0.12
=0.63*1.2+0.01*1.2+0.63*0.2-0.12
=0.63*(1.2+0.2)+0.01*1.2-0.12
=0.63*1.4+0.012-0.12
=0.882+0.012-0.12
=0.894-0.12
=0.774
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