简便计算:8×72×125 &nbs...
简便计算:8×72×125102×3649×99+492485-(760+1485)198÷2×45+45....
简便计算:8×72×125 102×36 49×99+49 2485-(760+1485) 198÷2×45+45.
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(1)8×72×125,
=8×125×72,
=1000×72,
=72000;
(2)102×36,
=(100+2)×36,
=100×36+2×36,
=3600+72,
=3672;
(3)49×99+49,
=(99+1)×49,
=100×49,
=4900;
(4)2485-(760+1485),
=2485-1485-760,
=1000-760,
=240;
(5)198÷2×45+45,
=99×45+45,
=(99+1)×45,
=100×45,
=4500.
=8×125×72,
=1000×72,
=72000;
(2)102×36,
=(100+2)×36,
=100×36+2×36,
=3600+72,
=3672;
(3)49×99+49,
=(99+1)×49,
=100×49,
=4900;
(4)2485-(760+1485),
=2485-1485-760,
=1000-760,
=240;
(5)198÷2×45+45,
=99×45+45,
=(99+1)×45,
=100×45,
=4500.
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