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六年级数学复习,有这样一道题:移动公司有两种优惠用户的计划,如下表。请问:当用户的每月通话时间最少是多少分钟时,两种计划的话费是相等的?思考片刻,有的学生是这样做的:60—40=20(元),20÷0.2=100(分钟),100+60=160(分钟),通过验算:计划一,160分钟减去60分钟的免费通话时间,还有100分钟计费时间,100×0.2=20(元),20元的记时收费加40元的最低消费等于60元,而160分钟还在计划二的免费200分钟内,所以答案是对的。
Sixth grade mathematics review, there is such a problem: mobile company has two types of discount plans, as the table below. Excuse me: When the user’s monthly talk time is at least minutes, the two plan calls are equal? Thinking for a moment, some students do this: 60-40 = 20 (yuan), 20 ÷ 0.2 = 100 ( Minutes), 100 +60 = 160 (minutes), through the check: a plan, 160 minutes minus 60 minutes of free talk time, and 100 minutes billing time, 100 × 0.2 = 20 The minimum charge when you add $ 40 is equal to $ 60, while the 160-minute count is still within the second 200 for free in Plan Two, so the answer is yes.