1 9\4 : 0,7 =? Помогите пж!

9\4÷0,7 9/4÷7/10 9/4×10/7 9/2×5/7 45/14

[latex] \frac{19}{4} [/latex]÷0.7=[latex] \frac{19x10}{4x7} [/latex]=[latex] \frac{190}{28} [/latex]=6/7