99x7+77x9+33x18如何簡便計算
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99×7+77×9+33×18的簡便計算方法為:
99×7+77×9+33×18
=11×9×7+11×7×9+11×3×18
=11×63+11×63+11×54
=11×180
=(10+1)×180
=10×180+1×180
=1980
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99×7+77×9+33×18的簡便計算方法為:
99×7+77×9+33×18
=11×9×7+11×7×9+11×3×18
=11×63+11×63+11×54
=11×180
=(10+1)×180
=10×180+1×180
=1980