题目内容
①(-4)-(-7)-(+6)=_____________.
②-(-)+-(+)=_____________.
(1)(-28)-(+12)-(-3)-(+6);
(2)(-25)+(-7)-(-15)-(-6)+(-11)-(-2);
(3)(-0.5)-(-2.1)+(+0.3)-(+0.5)+(-0.3);
把下列各式写成省略加号的和的形式:
(+7)+(-3)-(-2)=________.
=________.