用简便方法计算.(8+40)×25 25×125×4×834×102 72×125.
(1)(8+40)×25
=8×25+40×25
=200+1000
=1200;
(2)25×125×4×8
=25×4×(125×8)
=100×1000
=100000;
(3)34×102
=34×(100+2)
=34×100+34×2
=3400+68
=3468;
(4)72×125
=9×(8×125)
=9×1000
=9000.
=8×25+40×25
=200+1000
=1200;
(2)25×125×4×8
=25×4×(125×8)
=100×1000
=100000;
(3)34×102
=34×(100+2)
=34×100+34×2
=3400+68
=3468;
(4)72×125
=9×(8×125)
=9×1000
=9000.
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