如题所述
9X123-9×23
=9x(123-23)
=9x100
=900
=9x(123-23)
=9x100
=900
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第1个回答 2022-12-13
乘法分配律为:两个数的和与一个数相乘,先将它们与这个数分别相乘,再相加,积不变.即:(a+b)×c=a×c+b×c.反过来则:a×c+b×c=(a+b)×c
9×123-9×23
= 9× ( 123-23)
= 9×100
= 900
9×123-9×23
= 9× ( 123-23)
= 9×100
= 900