出答案.
解答:解:(1)(+12)+(-7)-(+15);
=5-15,
=-10;
(2)原式=-
1
12
×12+
3
4
×12+
1
6
×12
=-1+9+2
=10;
(3)-24÷(-3)+6×(-
1
3
),
=8+(-2),
=6
(4)-22+8÷(-2)2.
=-4+8÷4=6
=-4+2
=-2.
出答案.
解答:解:(1)(+12)+(-7)-(+15);
=5-15,
=-10;
(2)原式=-
1
12
×12+
3
4
×12+
1
6
×12
=-1+9+2
=10;
(3)-24÷(-3)+6×(-
1
3
),
=8+(-2),
=6
(4)-22+8÷(-2)2.
=-4+8÷4=6
=-4+2
=-2.