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=10×6=60
b.ls=Lp:2
=60:2=30
2.a.k=20 +14=34×2=68
L=14×20=280-(5×5×2)
280-50=230
b. K=4×2+8×4+12×2
8+32+24=64
L=(12×4×2)+(4×4)
96+16=112