Вычислите наиболее удобным способом :
1) 1,3*0,45*7,2
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1,5*1,2*0,65



2)1,7*4,5*6,9*1,1
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0,23*6,8*0,9*5,5



3) 0,25*3,6*0,76
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0,45*0,19*0,5



4) 0,25*18,6*4,2*5,7
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1,9*1,26*3,1*0,5
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