求45×0.99和2.5×36的简便计算
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求45×0.99和2.5×36的简便计算
![求45×0.99和2.5×36的简便计算](/uploads/image/z/15776596-28-6.jpg?t=%E6%B1%8245%C3%970.99%E5%92%8C2.5%C3%9736%E7%9A%84%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
45×0.99
=45×(1-0.01)
=45×1-45×0.01
=45-0.45
=44.55
2.5×36
=2.5×(4×9)
=(2.5×4)×9
=10×9
=90
=45×(1-0.01)
=45×1-45×0.01
=45-0.45
=44.55
2.5×36
=2.5×(4×9)
=(2.5×4)×9
=10×9
=90