December 2021 1 11 Report
Вычислите рациональным способом:
1) 45*52-52*42+42*51-51*39+39*50-50*36+36*49-49*33;
2) 9,3*2,5-2,5*8,9+8,9*2,4-2,4*8,5+8.5*2,3-2,3*8,1+8,1*2,2-2,2*7,7.
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