A. 25+199×25用最簡便的方法計算
解:25+199×25等於( 5000 ) ∵已知需求出25+199×25等於多少 X + X × Y = X × (1 + Y) ∴25 + 199 × 25 = 25 × (1 + 199) = 25 × 200 = 5000 答:25+199×25等於5000