题目内容
计算
(1)(-7)-9-(-3)+(-5);
(2)(-
)+(+
)+(+
)+(-1
);
(3)-24×(-
+
-
);
(4)(-2)÷
×(-3);
(5)-14+8÷(-2)2-(-4)×(-3);
(6)-19
×3.(用简便计算)
(1)(-7)-9-(-3)+(-5);
(2)(-
1 |
3 |
2 |
5 |
3 |
5 |
2 |
3 |
(3)-24×(-
1 |
2 |
3 |
4 |
1 |
3 |
(4)(-2)÷
1 |
3 |
(5)-14+8÷(-2)2-(-4)×(-3);
(6)-19
8 |
9 |
(1)(-7)-9-(-3)+(-5)
=-7-9+3-5
=-21+3
=-18;
(2)(-
)+(+
)+(+
)+(-1
)
=(-
-1
)+(+
+
)
=-2+1
=-1;
(3)-24×(-
+
-
)
=24×
-24×
+24×
=12-18+8
=2;
(4)(-2)÷
×(-3)
=-6×(-3)
=18;
(5)-14+8÷(-2)2-(-4)×(-3)
=-1+8÷4-12
=-1+2-12
=-11;
(6)-19
×3
=(-20+
)×3
=-20×3+
×3
=-60+
=-59
.
=-7-9+3-5
=-21+3
=-18;
(2)(-
1 |
3 |
2 |
5 |
3 |
5 |
2 |
3 |
=(-
1 |
3 |
2 |
3 |
2 |
5 |
3 |
5 |
=-2+1
=-1;
(3)-24×(-
1 |
2 |
3 |
4 |
1 |
3 |
=24×
1 |
2 |
3 |
4 |
1 |
3 |
=12-18+8
=2;
(4)(-2)÷
1 |
3 |
=-6×(-3)
=18;
(5)-14+8÷(-2)2-(-4)×(-3)
=-1+8÷4-12
=-1+2-12
=-11;
(6)-19
8 |
9 |
=(-20+
1 |
9 |
=-20×3+
1 |
9 |
=-60+
1 |
3 |
=-59
2 |
3 |
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