题目合理计算:3.4×17+5.7÷73.4\times \frac{1}{7}+5.7\div 73.4×71+5.7÷7；8.45−311+1.55−68118.45-\frac{3}{11}+1.55-6\frac{8}{11}8.45−113+1.55−6118；45×3.5+5.5×80%+0.8\frac{4}{5}\times 3.5+5.5\times 80\%+0.854×3.5+5.5×80%+0.8.知识点：二次根式的混合运算章节：数与式 / 二次根式
