题目内容
计算:(1)
-(
+
-
)×(-12);
(2)3.1416×6.4955+3.1416×(-5.4955).
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(2)3.1416×6.4955+3.1416×(-5.4955).
(1)
-(
+
-
)×(-12)=
+(
×12+
×12-
×12)=
+5+8-9=4
;
(2)3.1416×6.4955+3.1416×(-5.4955)=3.1416×(6.4955-5.4955)=3.1416.
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(2)3.1416×6.4955+3.1416×(-5.4955)=3.1416×(6.4955-5.4955)=3.1416.
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