题目有问题吗?哈哈 这样就可以了
0.049×2500+490×0.24+51×4.9
=4.9*25+4.9*24+4.9*51
=4.9*（25+24+51）
=4.9*100
=490
0.049×2500+495×0.24+51×4.9=
1个回答
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