题目内容
综合计算题(写出必要的步骤)
(1)(-7)×(-5)-90÷(-3)÷0.3
(2)-|-7|-[-8-(5-6)]-(-2)
(3)(-
+
-
)×(-48)-(-5)
(4)-14-[4-(-2)3]÷6.
(1)(-7)×(-5)-90÷(-3)÷0.3
(2)-|-7|-[-8-(5-6)]-(-2)
(3)(-
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(4)-14-[4-(-2)3]÷6.
(1)原式=35-(-30)÷0.3=35+30×
=35+100=135;
(2)原式=-7-[-8-(-1)]+2=-7-(-8+1)+2=-7-(-7)+2=-7+7+2=2;
(3)原式=(-48)×(-
)+(-48)×
-(-48)×
+5=8-36+4+5=-19;
(4)原式=-1-[4-(-8)]×
=-1-12×
=-1-2=-3.
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(2)原式=-7-[-8-(-1)]+2=-7-(-8+1)+2=-7-(-7)+2=-7+7+2=2;
(3)原式=(-48)×(-
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(4)原式=-1-[4-(-8)]×
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