Question

26.1×4.5-6.1×4.5用简便方法计算

Answer 1

26.1×4.5-6.1×4.5
=（20+6.1）x4.5-6.1x4.5
=20x4.5+6.1x2.5-6.1x4.5
=90+（6.1-6.1）x2.5
=90+0
=90
希望能帮到你！