题目内容
计算下列各题,能简便的要简便.
| ①0.25×4.78×4 | ②65×201 | ③17×23-23×7. |
①0.25×4.78×4,
=0.25×4×4.78,
=1×4.78,
=4.78;
②65×201,
=65×(200+1),
=65×200+65×1,
=1300+65,
=1365;
③17×23-23×7,
=(17-7)×23,
=10×23,
=230.
=0.25×4×4.78,
=1×4.78,
=4.78;
②65×201,
=65×(200+1),
=65×200+65×1,
=1300+65,
=1365;
③17×23-23×7,
=(17-7)×23,
=10×23,
=230.
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