题目内容
125×3×8=______×______×3;
998×45=(______-2)×45=______×45-______×45.
998×45=(______-2)×45=______×45-______×45.
(1)125×3×8,
=(125×8)×3,
=1000×3,
=3000;
(2)998×45,
=(1000-2)×45,
=1000×45-2×45,
=45000-90
=44910.
=(125×8)×3,
=1000×3,
=3000;
(2)998×45,
=(1000-2)×45,
=1000×45-2×45,
=45000-90
=44910.
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