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2.5*3.8*0.4 6.7*4.5+4.5*13.3 2.06*0.9+2.06 0.8*[0....

2.5*3.8*0.4=2.5*0.4*3.8=1*3.8=3.8, 6.7*4.5+4.5*13...

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