(1)解方程:9﹣3y=5y+25(2)计算:(﹣3)3÷×(﹣)2﹣2×(﹣)
计算:
(2011江苏盐城,19(1),4分)计算:;
(2011山东东营,18,3分)计算:
(20011江苏镇江,18,4分)计算:sin45°;