Question

脱式计算，能简便的用简便方法计算． 7.29×4.6+46×1.271 &...

脱式计算，能简便的用简便方法计算． 7.29×4.6+46×1.271 21.98÷0.25÷40.52×9.6÷3.2 4.8÷[4×（1.34-0.14）]．

Answer 1

（1）7.29×4.6+46×1.271
=0.729×46+46×1.271
=（0.729+1.271）×46
=2×46
=92；

（2）21.98÷0.25÷4
=21.98÷（0.25×4）
=21.98×1
=21.98；

（3）0.52×9.6÷3.2
=0.52×（9.6÷3.2）
=0.52×3
=1.56；

（4）4.8÷[4×（1.34-0.14）]
=4.8÷[4×1.2]
=4.8÷4.8
=1．