4.5×3.5 45×0.62 5.5×9.7
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4.5×3.5 +45×0.62 +5.5×9.7
=4.5x3.5+4.5x6.2+5.5x9.7
=4.5x（3.5+6.2）+5.5x9.7
=4.5x9.7+5.5x9.7
=(4.5+5.5)x9.7
=10x9.7
=97
=4.5x3.5+4.5x6.2+5.5x9.7
=4.5x（3.5+6.2）+5.5x9.7
=4.5x9.7+5.5x9.7
=(4.5+5.5)x9.7
=10x9.7
=97
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