Вычислите удобным 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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