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班里做数学题就数小熊做得又对又快,大家问他有什么诀窍,小熊说,做题要讲究方法,如下面几道题:(1)7+6+3,一般方法是先算7+6=13,再算13+3=13。巧妙算法是先算7+3=10,1 0+6=1 6。(2)12+5-2,一般方法是先算12+5=17,再算17-2=1 5。巧妙算法是先算12-2=10,再算10+5=15。(3)9+5-4,一般方法是先算9+5=14,再算14-4=10。巧妙算法先算9-4=5,再算5+5=10。
The class to do math problems on the number of cubs to do again and again, we ask him any know-how, bear said, to pay attention to methods, such as the following questions: (1) 7 +6 +3, the general method is Count 7 + 6 = 13, then count 13 + 3 = 13. The clever algorithm is to first calculate 7 + 3 = 10,1 0 + 6 = 1 6. (2) 12 + 5-2, the general method is to count 12 + 5 = 17, then calculate 17-2 = 15. Clever algorithm is to count 12-2 = 10, then count 10 +5 = 15. (3) 9 + 5-4, the general method is to first count 9 +5 = 14, then count 14-4 = 10. Clever algorithm first count 9-4 = 5, then count 5 + 5 = 10.