Question

1.9✖️99➕1.9简便方法？

Answer 1

1.9×99+1.9
=1.9×（99+1）
=1.9×100
=190

Answer 2

1.9×99＋1.9
＝1.9×（99＋1）
＝1.9×100
＝190

Answer 3

1.9x(99+1)
=1.9x100
=190

Answer 4

1.9×99+1.9
=1.9×（99+1）
=1.9×100
=190

Answer 5

原式=1.9×99+1.9×1
=1.9×（99+1）
=1.9×100
=190