题目内容
| 简便运算. 101×93 | 1230-347-453 | 25×39+25 |
| 38×65-55×38 | 87×8-8×12+25×8 | 25×32×125. |
(1)101×93,
=100×93+1×93,
=9300+93,
=9393;
(2)1230-347-453,
=1230-(347+453),
=1230-800,
=430;
(3)25×39+25,
=25×(39+1),
=25×40,
=1000;
(4)38×65-55×38,
=38×(65-55),
=38×10,
=380;
(5)87×8-8×12+25×8,
=8×(87-12+25),
=8×100,
=800;
(6)25×32×125,
=(25×4)×(8×125),
=100×1000,
=100000;
=100×93+1×93,
=9300+93,
=9393;
(2)1230-347-453,
=1230-(347+453),
=1230-800,
=430;
(3)25×39+25,
=25×(39+1),
=25×40,
=1000;
(4)38×65-55×38,
=38×(65-55),
=38×10,
=380;
(5)87×8-8×12+25×8,
=8×(87-12+25),
=8×100,
=800;
(6)25×32×125,
=(25×4)×(8×125),
=100×1000,
=100000;
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