Используя свойства действия, вычислить наиболее удобным способом :
1)3/5+ 3 3/4+1 2/5 +1 1/4
2) 3,2*5/6*5*6
3)2 1/4*1 1/7*4*7
4)3,81*4,3+6,19*4,3
5)4,7-2,13-5,3-2,87
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