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2014-06-04T22:06:09+03:00
2×1.5+3×0.2=3+0.6=3.6
1.5-0.2=1.3
1.5×1.5-0.2×0.2=2.25-0.04=2.21
10×1.5-0.2:2×10=15-4=11
5 5 5