6.9*25.8+0.31*258 简便计算有木有?

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6.9*25.8+0.31*258 简便计算有木有?

这里最主要要找同类项,0.31 × 258可以看作3.1 × 25.8
6.9× 25.8 + 0.31 × 258
= 6.9 × 25.8 + 3.1 × 25.8
= (6.9 +3.1)× 25.8
= 10 × 25.8
= 258

6.9× 25.8 + 0.31 × 258
= 6.9 × 25.8 + 3.1 × 25.8
= (6.9 +3.1)× 25.8
= 10 × 25.8
= 258