17×9.9+1.7
=17×(10-0.1)+1.7
=170-1.7+1.7
=170
17×9.99+1.7
=(l7÷10)×(9.9×10)+11.7/
=l.7×99+1.7
=1.7×(99+1)
=1.7×100
=170
17×9.9+1.7
=1.7×99+1.7
=1.7×(99+1)
=170
17✖️9.9➕1.7
=1.7×99+1.7
=1.7×(99+1)
=1.7×100
=170
17×9.9+1.7
=17×9.9+17×0.1
=17×(9.9+0.1)
=17×10
=170