计算:(1)6-(+3)-(-7)+(-2);(2)-0.5-(-314)+2.75-7;(3)-|-9|×|-123|-(10);(4)-22×2-3×(-1)2;(5)(23-112-115)÷(

题目简介

计算:(1)6-(+3)-(-7)+(-2);(2)-0.5-(-314)+2.75-7;(3)-|-9|×|-123|-(10);(4)-22×2-3×(-1)2;(5)(23-112-115)÷(

题目详情

计算:
(1)6-(+3)-(-7)+(-2);
(2)-0.5-(-3
1
4
)+2.75-7;
(3)-|-9|×|-1
2
3
|-(10);
(4)-22×2-3×(-1)2
(5)(
2
3
-
1
12
-
1
15
÷(-
1
60
)

(6)-99
71
72
×36(用简便方法计算).
题型:解答题难度:中档来源:不详

答案

(1)6-(+3)-(-7)+(-2)
=6-3+7-2
=8;

(2)-0.5-(-3class="stub"1
4
)+2.75-7
=-0.5+3.25+2.75-7
=(-0.5-7)+(3.25+2.75)
=-7.5+6
=-1.5;

(3)-|-9|×|-1class="stub"2
3
|-(10)
=-9×class="stub"5
3
-10
=-15-10
=-25;

(4)-22×2-3×(-1)2
=-4×2-3×1
=-8-3
=-11;

(5)(class="stub"2
3
-class="stub"1
12
-class="stub"1
15
÷(-class="stub"1
60
)

=(class="stub"2
3
-class="stub"1
12
-class="stub"1
15
)×(-60)
=-40+5+4
=-31;

(6)-99class="stub"71
72
×36
=(-100+class="stub"1
72
)×36
=-3600+class="stub"1
2

=-3599class="stub"1
2

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