根据乘法的运算定律填空.
(1)×40×
=
× × = ;
(2)= ×( + )= ;
(3)×20= × + × = + = ;
(4)﹣
=( ×( 一 )= .
根据运算定律填空.
(1)×
×
=
× ×
(2)×
×9=
×( × )
(3)(14+)×
= × + × .
在横线上写出所运用的乘法运算定律.
26×94+26×6=26×(94+6)
402×13=400×13+2×13
125×7×8=(125×8)×7
43×25×4=43×(25×4) .
填空.
25×18×4=( × )×
(125×5)×8=( × )×
(13×20)×5×9=( × )×( × )
(125×4)×5×8=( × )×( × )
(1)(+
)×15= × + ×
(2)×
+
×
= ×( + )
(3)(+
)×5= +
(4)100×=(99+1)×
= + = .