Question

4.2×6点5+3点49×4点二的简便方式

4.2×6点5+3点49×4点二的简便方式

Answer 1

4.2×6点5+3点49×4点二
=4.2*【6.5+3.49】
=4.2*【10-0.01】
=42-0.042
=41.958
满意采纳

Answer 2

4.2×6.51+3.49×4.2
=4.2×（6.51+3.49）
=4.2×10
=42