同学们学习了减法,知道“被减数-减数=差”。但是,当被减数和减数同时在变化的时候,差会怎样变化,你想过吗?通过西西豆和小白杨树比身高的事,你会发现,如果被减数和减数变化的数是一样的,那么差就是不变的。如果变化不一样,那么差也就变化了。 Students learn subtraction, know “by the number of minus - minus the number of poor ”. But what happens when the difference is reduced by the sum of the subtractions and the subtractions? Have you ever thought of it? By comparing the height of the West Soybean and the Poplar, you will find that if the difference between the number of drops and the number of decreases The number is the same, then the difference is unchanged. If the changes are not the same, then the difference also changes.