Вычислите рациональным способом :
1)8,3×7+4,5×7+1,7×7+5,5×7;
2)0,85×4 +0,73×5+0,15×4+0,27×5;
1)8,3×7+4,5×7+1,7×7+5,5×7;
2)0,85×4 +0,73×5+0,15×4+0,27×5;
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1) 8,3×7+4,5×7+1,7×7+5,5×7=7*(8.3+1.7)+7*(4.5*5.5)=7*10+7*10=10*(7+7)=10*14=1402) 0,85×4 +0,73×5+0,15×4+0,27×5=4*(0.85+0.15)+5*(0.73+0.27)=4*1+5*1=4+5=9