问题
解答题
简算：22.5×0.39+7.75×3.9．
答案
22.5×0.39+7.75×3.9，
=2.25×3.9+7.75×3.9，
=（2.25+7.75）×3.9，
=10×3.9，
=39．
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简算：22.5×0.39+7.75×3.9．
22.5×0.39+7.75×3.9，
=2.25×3.9+7.75×3.9，
=（2.25+7.75）×3.9，
=10×3.9，
=39．