2. Вычислите, используя распределительное свойство:
1) 16•91 - 16•71;
2) 352 + 35•65;
3) 17•19 + 17•45 - 64•12.
1) 16•91 - 16•71;
2) 352 + 35•65;
3) 17•19 + 17•45 - 64•12.
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16·91-16·71=16·(91-71)=16·20=320;352+35·65=350+2+35·65=35·10+35·65+2=
=35(10+65)+2=35·75+2=2625+2=2627;
17·19+17·45-64·12=17·19+17·45-64·(17-5)=17·19+17·45-64·17+64·5=
=17·(19+45-64)+320=17·0+320=320