题目内容

(1)25×37×40
(2)27×27+27×73
(3)840÷6÷7
(4)99×37.
(1)25×37×40
=(25×40)×37
=1000×37
=37000;

(2)27×27+27×73
=27×(27+73)
=27×100
=2700;


(3)840÷6÷7
=840÷(6×7)
=840÷42
=20;

(4)99×37
=(100-1)×37
=100×37-37
=3700-37
=3663.
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