问题
解答题
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答案
(1)800-600÷20,
=800-30,
=770;
(2)18×(537-488),
=18×49,
=18×(50-1),
=18×50-18,
=900-18,
=882;
(3)39×101,
=39×(100+1),
=39×100+39,
=3939;
(4)735÷15×6,
=49×6,
=294;
(5)75×299+75,
=75×(299+1),
=75×300,
=22500;
(6)720÷16÷5,
=720÷(16×5),
=720÷80,
=9.