问题
解答题
计算: (1)15+(-22) (2)(-13)+(-8) (3)(-0.9)+1.51 (4)
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答案
(1)15+(-22)=-(22-15)=-7;
(2)(-13)+(-8)=-(13+8)=-21;
(3)(-0.9)+1.51=1.51-0.9=0.61;
(4)
+(-1 2
)=-2 3
.1 6
计算: (1)15+(-22) (2)(-13)+(-8) (3)(-0.9)+1.51 (4)
|
(1)15+(-22)=-(22-15)=-7;
(2)(-13)+(-8)=-(13+8)=-21;
(3)(-0.9)+1.51=1.51-0.9=0.61;
(4)
+(-1 2
)=-2 3
.1 6