问题
解答题
计算: (1)6-(+3)-(-7)+(-2); (2)-0.5-(-3
(3)-|-9|×|-1
(4)-22×2-3×(-1)2; (5)(
(6)-99
|
答案
(1)6-(+3)-(-7)+(-2)
=6-3+7-2
=8;
(2)-0.5-(-3
)+2.75-71 4
=-0.5+3.25+2.75-7
=(-0.5-7)+(3.25+2.75)
=-7.5+6
=-1.5;
(3)-|-9|×|-1
|-(10)2 3
=-9×
-105 3
=-15-10
=-25;
(4)-22×2-3×(-1)2
=-4×2-3×1
=-8-3
=-11;
(5)(
-2 3
-1 12
)÷(-1 15
)1 60
=(
-2 3
-1 12
)×(-60)1 15
=-40+5+4
=-31;
(6)-99
×3671 72
=(-100+
)×361 72
=-3600+1 2
=-3599
.1 2