25.4*8.4的简便方法
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25.4*8.4的简便方法
25.4*8.4
=(25+0.4)x8.4
=25x8.4+0.4x8.4
=25x(8+0.4)+0.4x(8+0.4)
=200+10+3.2+0.16
=213.36
25.4*8.4的简便方法
25.4*8.4
=(25+0.4)x8.4
=25x8.4+0.4x8.4
=25x(8+0.4)+0.4x(8+0.4)
=200+10+3.2+0.16
=213.36