3、听雨宝宝小学四年级数学—常用简便计算公式汇总练习
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1、a+b+c=(a b) c=(a c) b=a (b c)
2、a+b-c=(a c) b=a (b c)=(a b) c
3、a-b+c=(a b)c=(a c) b=a (b c)
4、a-b-c=(a b) c=(a c) b=a (b c)
5、a×b=b a
6、a×b×c=(a b) c=(a c) b=a (b c)
7、a×b÷c=(a b) c= a (b c)= (a c) b=a c b
8、a÷b÷c=(a b) c= a (b c)= (a c) b=a c b
9、a÷b×c=(a b) c= a (b c)= (a c) b=a c b
10、a+b×c= b c a
11、(a+b)×c=a c+b c=c (a b)= c (b a)
12、a×b+c=b a c
13、a×(b+c)=a b a c=b a c a = (b c) a
14、a×(b-c)=a b a c=b a c a = (b c) a
15、a÷(b+c)= a b a c= a c a b= a (b c)
16、a÷(b-c) = a b a c
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