45×5.5+45×5.5-1.5×3怎么巧算
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45×5.5+45×5.5-1.5×3巧算如下
45×5.5+45×5.5-1.5×3
=45×5.5+45×5.5-4.5×1
=45×5.5+45×5.5-45×0.1
=45×(5.5+5.5-0.1)
=45×10.9
=490.5
45×5.5+45×5.5-1.5×3
=45×5.5+45×5.5-4.5×1
=45×5.5+45×5.5-45×0.1
=45×(5.5+5.5-0.1)
=45×10.9
=490.5
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45×5.5+45×5.5-1.5×3巧算如下:
45×5.5+45×5.5-1.5×3
=45×5.5+45×5.5-4.5
=45×5.5+45×5.5-45×0.1
=45×(5.5+5.5-0.1)
=45×10.9
=490.5
45×5.5+45×5.5-1.5×3
=45×5.5+45×5.5-4.5
=45×5.5+45×5.5-45×0.1
=45×(5.5+5.5-0.1)
=45×10.9
=490.5
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45×5.5+45×5.5-1.5×3怎么巧算
45×5.5+45×5.5-1.5×3
=45×5.5+45×5.5-4.5×1
=4.5×55+4.5×55-4.5×1
=4.5×(55+55-1)
=4.5×(100+9)
=4.5×100+4.5×9
=450+4.5×10-4.5×1
=450+45-4.5
=490.5
45×5.5+45×5.5-1.5×3
=45×5.5+45×5.5-4.5×1
=4.5×55+4.5×55-4.5×1
=4.5×(55+55-1)
=4.5×(100+9)
=4.5×100+4.5×9
=450+4.5×10-4.5×1
=450+45-4.5
=490.5
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45×5.5+45×5.5-1.5×3巧算:
45×5.5+45×5.5-1.5×3 =45×5.5+45×5.5-4.5×1 =45×5.5+45×5.5-45×0.1 =45×(5.5+5.5-0.1)
=45×10.9
=490.5
45×5.5+45×5.5-1.5×3 =45×5.5+45×5.5-4.5×1 =45×5.5+45×5.5-45×0.1 =45×(5.5+5.5-0.1)
=45×10.9
=490.5
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