=1.26×（99+1）=1.26×100=126
1.26×99+1.26=1.26×(99+1)=1.26×100=126
列竖式计算1.26ⅹ99+1.26 1.26ⅹ99+1.26＝1.26ⅹ（99+1）＝1.26ⅹ100＝126
