题目内容
计算:
(1)(-121.4)+(-78.5)-(-8
)-(-121.4)
(2)3
-(-2
)+(-
)-
-(+
).
(1)(-121.4)+(-78.5)-(-8
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(2)3
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(1)(-121.4)+(-78.5)-(-8
)-(-121.4)=-121.4-78.5+8
+121.4=-70;
(2)3
-(-2
)+(-
)-
-(+
)=3
+2
-
-
-
=6
-
=6.
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(2)3
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