又见面了,小朋友,又见面了小朋友,嘿嘿! 小云家和小林家相距四点五千米,周日早上九时,两人分别从家骑自行车相向而行,两人何时相遇? 小云每分钟骑二百米,小林每分钟骑二百五十米, 已知条件告给我们。小云家和小林家相距四点五千米,这是知道了准路程, 还知道了小云每分钟骑二百米,小林每分钟骑二百五十米,这是两人各自的速度。 还知道周日走上九十,两人分别重加骑自行车相向而行。 相向而行就是面对面行驶,面对面骑车, 求的是两人何时相遇。我们画线段图,分析数量关系,我们把题中的长度单位统一成签名, 二百米等于零点二千米,二百五十米等于零点二五千米。我们画一条线段,表示小云家和小林家 之间的总路程,他们相向而行,经过一段时间后他们相遇。 我们假比如在这里相遇。从图中我们可以看出,小荣骑的路程加上小林骑的路程等于总路程。 我们劫色,两人 x 分钟后相遇。好用,每分钟其零点二千米, 那么 x 分钟后他骑的路程是零点二 x, 小林每分钟骑零点二五千米,那么 x 分钟后骑的路程是零点二五 x, 零点二 x 加上零点二五 x 就是总路程。 四点五,零点二 x 加上零点二五 x 等于零点四五 x, 零点四五 x 等于四点五,方程的左右两边都除以零点四五 x 九等于十。答,两人十分钟后相遇。
粉丝2484获赞1.8万

第七十八页 append is four useful expressions 常用表达法 unit one is he young is he young? no he isn't no he isn't what's she like what's she like she's kind she's kind unit two what do you have on thursday? what do you have on thursday? i have mass english and music i have mass english and music do you often read books in this park do you often read books in this park? no i don't no i don't unit three what would you like to eat what would you like to eat a sandwich please a sandwich please what would you like to drink? what would you like to drink? i'd like some water i'd like some water what's your favorite food? what's your favorite food noodles they are delicious noodles they are delicious unit four what can you do for the party children? what can you do for the party children? i can sing english songs i can sing english songs can you do any kung fu john can you do any kung fu john yes i can yes i can。