(1) | - 5 | - ( - 3 ) 2 - ( 7 ) 0
(2) ( a - b ) 2 - a ( a - 2 b )
计算(1) (2)
计算:
计算: (1) (2)
计算:﹣×﹣(2﹣)2.
计算:-3sin60°-cos30°+2tan45°.