S ΔADE =S ΔЕАВ-SΔ ADВ=4*8/2-SΔ ADВ=16-SΔ ADВ
S ΔВDС =S ΔАВС-SΔ ADВ=4*6/2-SΔ ADВ=12-SΔ ADВ
S ΔADE-S ΔВDС =16-SΔ ADВ-(12-SΔ ADВ)=16-SΔ ADВ-12+SΔ ADВ=4
Ответ b) 4
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S ΔADE =S ΔЕАВ-SΔ ADВ=4*8/2-SΔ ADВ=16-SΔ ADВ
S ΔВDС =S ΔАВС-SΔ ADВ=4*6/2-SΔ ADВ=12-SΔ ADВ
S ΔADE-S ΔВDС =16-SΔ ADВ-(12-SΔ ADВ)=16-SΔ ADВ-12+SΔ ADВ=4
Ответ b) 4