计算:(1)6-(+3)-(-7)+(-2);(2)-0.5-(-314)+2.75-7;(3)-|-9|×|-123|-(10);(4)-22
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...
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)÷(?160); (6)-997172×36(用简便方法计算).
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(1)6-(+3)-(-7)+(-2)
=6-3+7-2
=8;
(2)-0.5-(-3
)+2.75-7
=-0.5+3.25+2.75-7
=(-0.5-7)+(3.25+2.75)
=-7.5+6
=-1.5;
(3)-|-9|×|-1
|-(10)
=-9×
-10
=-15-10
=-25;
(4)-2
2×2-3×(-1)
2=-4×2-3×1
=-8-3
=-11;
(5)(
??)
÷(?) =(
??)×(-60)
=-40+5+4
=-31;
(6)-99
×36
=(-100+
)×36
=-3600+
=-3599
.
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