用简便方法计算125×37×8 65×64+65×...
用简便方法计算125×37×865×64+65×3698×99+9899×27125×(80-8)25×36....
用简便方法计算125×37×8 65×64+65×36 98×99+9899×27 125×(80-8)25×36.
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(1)125×37×8
=125×8×37
=1000×37
=37000;
(2)65×64+65×36
=65×(64+36)
=65×100
=6500;
(3)98×99+98
=98×(99+1)
=98×100
=9800;
(4)99×27
=(100-1)×27
=100×27-1×27
=2700-27
=2673;
(5)125×(80-8)
=125×80-125×8
=10000-1000
=9000;
(6)25×36
=25×(4×9)
=25×4×9
=100×9
=900.
=125×8×37
=1000×37
=37000;
(2)65×64+65×36
=65×(64+36)
=65×100
=6500;
(3)98×99+98
=98×(99+1)
=98×100
=9800;
(4)99×27
=(100-1)×27
=100×27-1×27
=2700-27
=2673;
(5)125×(80-8)
=125×80-125×8
=10000-1000
=9000;
(6)25×36
=25×(4×9)
=25×4×9
=100×9
=900.
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