Вычислите более рациональным способом.
в) 3 2/5*2 3/7*5*7
г) (12 2/9+24 2/3-16 2/15):2
в) 3 2/5*2 3/7*5*7
г) (12 2/9+24 2/3-16 2/15):2
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17/5 *17/7 *5*7=17/5*5 * 17/7*7=17*17=2892(6 1/9 + 12 1/3 -8 1/15):2=6 1/9+ 12 3/9-8 1/15= 18 4/9 -8 1/15=18 20/45 - 8 3/45=10 17/45