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计算:(1)(-10)+8(2)(-0.25)×135(3)(-8)+10+2-1(4)(-337)-(-1.25)+(-1647)-(+2.5)

题目详情
计算:
(1)(-10)+8                    
(2)(-0.25)×1
3
5

(3)(-8)+10+2-1
(4)(-3
3
7
)-(-1.25)+(-16
4
7
)-(+2.5)
▼优质解答
答案和解析
(1)(-10)+8=-2;                    
(2)(-0.25)×1
3
5
=-
2
5

(3)(-8)+10+2-1
=(-8-1)+(10+2)
=-9+12
=3;
(4)(-3
3
7
)-(-1.25)+(-16
4
7
)-(+2.5)
=(-3
3
7
-16
4
7
)+(1.25-2.5)
=-20-1.25
=-21.25.