两个数的差是3.2,被减数不变,减数增加0.2,差是()甲数比乙数多5,乙数的小数点向左移动2位后是0.25,原来甲乙两数的和是?
问题描述:
两个数的差是3.2,被减数不变,减数增加0.2,差是()
甲数比乙数多5,乙数的小数点向左移动2位后是0.25,原来甲乙两数的和是?
答
1.a - b = 3.2
a - (b + 0.2) = a - b - 0.2 = 3.2 - 0.2 = 3
2.a - b = 5
b = 0.25 * 100 = 25
a = b + 5 = 25 + 5 = 30
a + b = 30 + 25 = 55