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2014-11-18T13:44:58+02:00
A)ax(b+c)=ab+ac=490+350=840
840:7=120
b)ax(b-c)=ab-ac=490-350=140
140:10=14
2014-11-18T13:48:01+02:00
Axb+axc:7= (490+350):7= 840:7=120
(axb-axc):10= (490-350):10=140:10=14
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