6. Вычислите. 1) 15 * 13 + 15 * 29 + 42 * 19 + 34 * 58 2) 72 * 19 + 72 * 34 + 53 * 17 + 89 * 47 3) 2.8*6, 9 + 6 ,9*3,6+6,4*2,8+9,7*3,6 4) 8,3*1, 8 + 1 ,8*7,6-1,8-5,9 5) 8,4*4, 7 - 8 ,4*2,3+2,4*5,8-14,2*1,4 6) 2,9*74+29*2,6+7, 1 * 59 + 71 * 4 ,1 7) 5 3/8 * 4 7/19 + 5 3/8 * 3 12/19
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