284* 16-6 *84 简便运算
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284* 16-6 *84 简便运算
284* 16-6 *84 简便运算
284* 16-6 *84 简便运算
284* 16-6 *84
=568*8-63*8
=(568-63)*8
=505*8
=500*8+5*8
=4000+40
=4040
284* 16-6 *84 简便运算
284* 16-6 *84 简便运算
284* 16-6 *84 简便运算
284* 16-6 *84
=568*8-63*8
=(568-63)*8
=505*8
=500*8+5*8
=4000+40
=4040