x÷80%+9/10=3
(5/4)x=3-9/10
x=21/10 × 5/4
x=42/25
x除以80%+9/10=3解方程，答案和过程都要
x÷80%+9/10=3
(5/4)x=3-9/10
x=21/10 × 5/4
x=42/25
x÷80%+9/10=3
(5/4)x=3-9/10
x=21/10 × 5/4
x=42/25
x÷80%+9/10=3
(5/4)x=3-9/10
x=21/10 × 5/4
x=42/25
x÷80%+9/10=3
(5/4)x=3-9/10
x=21/10 × 5/4
x=42/25