计算:
(1) | - 6 | + ( - 2 ) 3 + ( 7 ) 0 ;
(2) ( a + b ) ( a - b ) - a ( a - b )
计算: (1) (2)
计算: (1) (2).
(1)计算: (2)解方程:
(1) (2)2﹣4÷×(﹣) (3)﹣22+4×(﹣3)2+6. (4)
合并同类项: (1) (2)4x3 - [ -x2 + 2( x3 -x2 )]