(1)
DC=t-4
D(4-t,4)
(4-t+2)×4÷2=2×4÷4
t=5
(2)
①当S三角形BCD=1/3S长方形ABCO时,
(4-t)×2÷2=2×4÷3
t=4/3
∴D(0,4/3)
②当S三角形BCD=2/3S长方形ABCO时,
(4-t)×2÷2=2×4÷3×2
t
(1)
DC=t-4
D(4-t,4)
(4-t+2)×4÷2=2×4÷4
t=5
(2)
①当S三角形BCD=1/3S长方形ABCO时,
(4-t)×2÷2=2×4÷3
t=4/3
∴D(0,4/3)
②当S三角形BCD=2/3S长方形ABCO时,
(4-t)×2÷2=2×4÷3×2
t