问题
解答题
简便计算:
|
答案
(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,
=49×(99+1),
=49×100,
=4900;
(4)900÷25,
=900÷5÷5,
=180÷5,
=36.
简便计算:
|
(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,
=49×(99+1),
=49×100,
=4900;
(4)900÷25,
=900÷5÷5,
=180÷5,
=36.