Question

0.88×1.25-0.25×0.8如何简便计算

Answer 1

0.88×1.25-0.25×0.8
=0.8×1.25+0.08×1.25-0.25×0.4×2
=1+0.1-0.1×2
=1.1-0.2
=0.9

Answer 2

0.88×1.25-0.25×0.8
＝0.11×8×1.25-0.25×4×0.2
＝0.11×(8×1.25)-1×0.2
＝0.11×10-0.2
＝1.1-0.2
＝0.9