题目内容
计算:
(1)![]()
(2)![]()
(3)![]()
(4)(-3.1)×(-2)+|6.9×(-2)|+3.3×(-2)
答案:略
解析:
解析:
|
(1) = = = =- 4(2) = = = (3) = = = (4)( -3.1)×(-2)+|6.9×(-2)|+3.3×(-2)=( -3.1)×(-2)+|13.8|+3.3×(-2)=( -3.1)×(-2)+13.8+3.3×(-2)=6.2 +13.8-6.6=13.4 |
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