(2 1/4-1 1/2)*8 помогите

[latex](2 \frac{1}{4}-1 \frac{1}{2} )*8=(2 \frac{1}{4} -1 \frac{2}{4} )*8= (1\frac{5}{4}-1 \frac{2}{4})*8= \frac{3*8}{4} =6 [/latex]