问题
解答题
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答案
(1)72×38+62×72+72
=(38+62)×72+72,
=100×72+72,
=7200+72,
=7272;
(2)132×101-132
=132×(100+1)-132,
=132×100+132×132-132,
=13200+132-132,
=13200;
(3)25×(4×68)
=25×4×68,
=100×68,
=6800;
(4)1200÷(12×5)
=1200÷12÷5,
=100÷5,
=20.