Question

0.85ⅹ72十85ⅹ0.28怎样用简便计算？

Answer 1

0.85*72+85*0.28
=0.85*72+0.85*28
=（72+28）*0.85
=100*0.85
=85

Answer 2

0.85x72十85x0.28
=0.85x72十0.85x28
=0.85x〈72十28）
=0.85x100
=85

Answer 3

0.85×72＋85×0.28
＝85×0.72＋85×0.28
＝85×（0.72＋0.28）
＝85×1
＝85

Answer 4

=0.85（72+100*0.28）
=0.85*100
=85

Answer 5

0.85×72＋85×0.28＝85×0.72＋85×0.28＝85×（0.72＋0.28）＝85×1＝85