х=(4.9/2.1)*0.5
х=1.16
х=4,9*0,5/2,1=2,45/2,1=приблежено 1,16
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х=(4.9/2.1)*0.5
х=1.16
х=4,9*0,5/2,1=2,45/2,1=приблежено 1,16