1.59×1.9+0.41×1.9﹣1.9
18.6﹣[12﹣0.328×（18.3+6.7）]
63÷[6.5×（3.4﹣3.32）+2.98]
96.12÷[（7﹣6.46）×（43.6+56.4）]
[49.84﹣（53.17﹣14.56）÷27]÷0.47．