Вычислите наиболее рациональным способом
47*15+53*15
29*72-29*22
9,3*34+16*9,3
8,3*18-18*5,8
47*15+53*15
29*72-29*22
9,3*34+16*9,3
8,3*18-18*5,8
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1) = 15 * ( 47 + 53 ) = 15 * 100 = 15002) = 29 * ( 72 - 22 ) = 29 * 50 = 1450
3) = 9,3 * ( 34 + 16 ) = 9,3 * 50 = 465
4) = 18 * ( 8,3 - 5,8 ) = 18 * 2,5 = 45