问题
解答题
用简便方法计算下列各题.
19×8×125 38+129+71 1756-398
406×201 16×125 1900÷4÷25.
答案
(1)119×8×125,
=119×(8×125),
=119×1000,
=119000;
(2)38+129+71,
=38+(129+71),
=38+200,
=238;
(3)1756-398,
=1756-400+2,
=1356+2,
=1358;
(4)406×201,
=406×(200+1),
=406×200+406×1,
=81200+406,
=81606;
(5)16×125,
=2×8×125,
=2×(8×125),
=2×1000,
=2000;
(6)1900÷4÷25,
=1900÷(4×25),
=1900÷100,
=19.