简便计算: 8×72×125 102×36 49×99+49 900÷25.
(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. |
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第1个回答 2015-12-04
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第2个回答 推荐于2016-07-18
(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.
=(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.