计算:(1)23+(-58);(2)(-2)2×(-5);(3)13-17-(-7);(4)-2-5+23-9+7;(5)-(-3)+|-3
计算:(1)23+(-58);(2)(-2)2×(-5);(3)13-17-(-7);(4)-2-5+23-9+7;(5)-(-3)+|-3|-(-3)2;(6)(?2)...
计算:(1)23+(-58);(2)(-2)2×(-5);(3)13-17-(-7);(4)-2-5+23-9+7;(5)-(-3)+|-3|-(-3)2;(6)(?2)÷13×(?3);(7)(-3)2×23-(-4)÷2;(8)12×(23-16);(9)-14+8÷(-2)2-(-4)×(-3);(10)0÷(-5)-53-5;(11)192425×(?25);(12)25×34?(?25)×12+25×(?14).
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(1)23+(-58)
=-(58-23)
=-35;
(2)(-2)2×(-5)
=4×(-5)
=-20;
(3)13-17-(-7)
=13-17+7
=3;
(4)-2-5+23-9+7
=-2-5-9+23+7
=14;
(5)-(-3)+|-3|-(-3)2;
=3+3-9
=-3
(6)(?2)÷
×(?3)
=-2×3×(-3)
=18;
(7)(-3)2×23-(-4)÷2
=9×8-(-2)
=74;
(8)12×(
-
)
=12×
-12×
=8-2
=6;
(9)-14+8÷(-2)2-(-4)×(-3)
=-1+2-12
=-11;
(10)0÷(-5)-53-5
=0-125-5
=-130;
(11)19
×(?25)
=(20-
)×(-25)
=-20×25+
×25
=-499;
(12)25×
?(?25)×
+25×(?
)
=25×(
+
-
)
=25.
=-(58-23)
=-35;
(2)(-2)2×(-5)
=4×(-5)
=-20;
(3)13-17-(-7)
=13-17+7
=3;
(4)-2-5+23-9+7
=-2-5-9+23+7
=14;
(5)-(-3)+|-3|-(-3)2;
=3+3-9
=-3
(6)(?2)÷
1 |
3 |
=-2×3×(-3)
=18;
(7)(-3)2×23-(-4)÷2
=9×8-(-2)
=74;
(8)12×(
2 |
3 |
1 |
6 |
=12×
2 |
3 |
1 |
6 |
=8-2
=6;
(9)-14+8÷(-2)2-(-4)×(-3)
=-1+2-12
=-11;
(10)0÷(-5)-53-5
=0-125-5
=-130;
(11)19
24 |
25 |
=(20-
1 |
25 |
=-20×25+
1 |
25 |
=-499;
(12)25×
3 |
4 |
1 |
2 |
1 |
4 |
=25×(
3 |
4 |
1 |
2 |
1 |
4 |
=25.
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