你好!
5×3 +a = 8×30 - b
15 + a = 240 - b
a + b = 240 - 15
a + b = 225
a×0.25 = b ÷ 0.25
a × 1/4 = b ÷ 1/4
a × 1/4 = b × 4
a ÷ b = 4 ÷ 1/4 = 4 × 4 = 16
即 a 是 b 的 16 倍
你好!
5×3 +a = 8×30 - b
15 + a = 240 - b
a + b = 240 - 15
a + b = 225
a×0.25 = b ÷ 0.25
a × 1/4 = b ÷ 1/4
a × 1/4 = b × 4
a ÷ b = 4 ÷ 1/4 = 4 × 4 = 16
即 a 是 b 的 16 倍