解：(70+80)×X等于( 150x ) ∵已知需求出(70+80)×X等于多少 ∴(70 + 80) × X = 70 × x + 80 × x = 70x + 80x = （70 + 80）x = 150x 答：(70+80)×X等于150x
(70+80)×X =150X
