Question

0.53X42十0.42×47简便方法计算？

Answer 1

原式等于0.53×42+0.47×42
=（0.53+0.47）×42
=1×42
=42

Answer 2

0.53×42＋0.42×47
＝42×（0.53＋0.47）
＝42×1
＝42