Bt1 ;Bỏ dấu ngặc rồi thực hiện phép tính
a, -3\(+\)\((\)-4\()\)-\((\)-3\()\)\(+\)\((\)2\(+\)7-10\()\)
b, 3- \((\)-3\(+\)2-7\()\)\(+\)\((\)-4\()\)
c, 7\(+\)\((\)-2-3\(+\)7\()\)-\((\)-2\()\)
d, -\((\)-3\()\)-\((\)-2\(+\)3-8\()\)\(+\)\((\)-6\()\)
Bt2; Rút gọn ;
a, x2-2x-\((\)3x -2x \()\)
b, -\((\)x2\(+\)3x2\()\)-\((\)-5x2\(+\)3x\()\)
c, \((\)x-y \()\)- \((\)x\(+\)3y \(+\)1\()\)