Jawaban:
U1= 5
U20= 81
(U1+U20) ÷ 2 × (20÷2)
=(5+81) ÷2 × 10
=86×5
=430
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Jawaban:
U1= 5
U20= 81
(U1+U20) ÷ 2 × (20÷2)
=(5+81) ÷2 × 10
=86×5
=430