题目内容
计算:
(1)(
-
+
)×(-36);
(2)[2-5×(-
)2]÷(-
);
(3)1
×
-(-
)×2
+(-
)÷1
;
(4)-14-[1-(1-0.5×
)×6].
(1)(
1 |
2 |
5 |
9 |
7 |
12 |
(2)[2-5×(-
1 |
2 |
1 |
4 |
(3)1
1 |
2 |
5 |
7 |
5 |
7 |
1 |
2 |
1 |
2 |
2 |
5 |
(4)-14-[1-(1-0.5×
1 |
3 |
(1)原式=
×(-36)-
×(-36)+
×(-36)
=-18+20-21
=-19;
(2)原式=(2-5×
)×(-4)
=2×(-4)-5×
×(-4)
=-8+5
=-3;
(3)原式=
×
+
×
-
×
=
×(
+
-
)
=
×
=
;
(4)原式=-1-[1-(1-
)×6]
=-1-(1-
×6)
=-1-(1-5)
=-1+4
=3.
1 |
2 |
5 |
9 |
7 |
12 |
=-18+20-21
=-19;
(2)原式=(2-5×
1 |
4 |
=2×(-4)-5×
1 |
4 |
=-8+5
=-3;
(3)原式=
3 |
2 |
5 |
7 |
5 |
7 |
5 |
2 |
1 |
2 |
5 |
7 |
=
5 |
7 |
3 |
2 |
5 |
2 |
1 |
2 |
=
5 |
7 |
7 |
2 |
=
5 |
2 |
(4)原式=-1-[1-(1-
1 |
6 |
=-1-(1-
5 |
6 |
=-1-(1-5)
=-1+4
=3.
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