63乘73减63乘699乘99加99简便
2016-05-13
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63乘73减63乘6
=63x(73-6)
=63x67
=63x60+63x7
=3780+441
=4221
99乘99加99简便
=99x(99+1)
=99x100
=9900
=63x(73-6)
=63x67
=63x60+63x7
=3780+441
=4221
99乘99加99简便
=99x(99+1)
=99x100
=9900
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