用简便方法计算下面各题. 42×(200+5) 57×18+43×18 (125-30)×8 25×43 57×99+57
用简便方法计算下面各题.42×(200+5)57×18+43×18(125-30)×825×4357×99+5746×102....
用简便方法计算下面各题. 42×(200+5) 57×18+43×18 (125-30)×8 25×43 57×99+57 46×102.
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(1)42×(200+5)
=42×200+5×42
=8400+210
=8610;
(2)57×18+43×18
=(57+43)×18
=100×18
=1800;
(3)(125-30)×8
=125×8-30×8
=1000-240
=760;
(4)25×43
=25×(40+3)
=25×40+25×3
=1000+75
=1075;
(5)57×99+57
=57×(99+1)
=57×100
=5700;
(6)46×102
=46×(100+2)
=46×100+46×2
=4600+92
=4692.
=42×200+5×42
=8400+210
=8610;
(2)57×18+43×18
=(57+43)×18
=100×18
=1800;
(3)(125-30)×8
=125×8-30×8
=1000-240
=760;
(4)25×43
=25×(40+3)
=25×40+25×3
=1000+75
=1075;
(5)57×99+57
=57×(99+1)
=57×100
=5700;
(6)46×102
=46×(100+2)
=46×100+46×2
=4600+92
=4692.
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