wwwdx77cn
@井帝6826：如果两个整数的和它们的差,乘积是77,那么这两个数是几和几 -
冯宰15891457624…… (a + b)(a - b) = 77,由于77只存在7 x 11与1x77两种情况,则可得四个方程组:1) a + b = 7 a - b = 11 解 a = 9, b = -22) a + b = 11 a - b = 7 解:a = 9, b =23) a + b = 1 a - b = 77 解:a = 39, b = -384) a + b = 77 a - b = 1 解 a = 39, b = 38
@井帝6826：230ⅹ76 760x77的简便运算? -
冯宰15891457624…… =230*76+76*770 =(230+770)*76 =1000*76 =76000 以上为简便计算过程.
冯宰15891457624…… (a + b)(a - b) = 77,由于77只存在7 x 11与1x77两种情况,则可得四个方程组:1) a + b = 7 a - b = 11 解 a = 9, b = -22) a + b = 11 a - b = 7 解:a = 9, b =23) a + b = 1 a - b = 77 解:a = 39, b = -384) a + b = 77 a - b = 1 解 a = 39, b = 38
@井帝6826：230ⅹ76 760x77的简便运算? -
冯宰15891457624…… =230*76+76*770 =(230+770)*76 =1000*76 =76000 以上为简便计算过程.
