题文
根据乘法的运算定律填空.
(1)
×40×
=
× × = ;
(2)
= ×( + )= ;
(3)
×20= × + × = + = ;
(4)
﹣
=( ×( 一 )= .
根据乘法的运算定律填空.
(1)
×40×
=
× × = ;
(2)
= ×( + )= ;
(3)
×20= × + × = + = ;
(4)
﹣
=( ×( 一 )= .
试题篮
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