Come on, math problem. . . . . . Enclose a cuboid with a 4.8m-long iron wire, and the ratio of length to width to height is 3: 2: 1.

Length+width+height = 4.8÷ 4 =1.2m;

Length =1.2× 3 ÷ (3+2+1) = 0.6m;

Width =1.2× 2÷ (3+2+1) = 0.4m;

Height =1.2-0.6-0.4 = 0.2m;

Volume =0.6×0.4×0.2=0.048 cubic meters;

20/ 13-(4/5+7/ 13)

=(20-7)/ 13-4/5

= 1-4/5

= 1/5;

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