题目内容
计算下列各题:
(1)(-15)×(-1
)
(2)0-1
×3
(3)(-3
)×(+
)
(4)(-18)×(
)-14×(-1
)
(5)(
)×(+1
)×(-2
)×(-3
).
(1)(-15)×(-1
2 |
3 |
(2)0-1
1 |
3 |
(3)(-3
1 |
3 |
3 |
5 |
(4)(-18)×(
5 |
6 |
1 |
7 |
(5)(
1 |
2 |
1 |
3 |
1 |
4 |
3 |
5 |
(1)(-15)×(-1
)=-15×(-
)=25;
(2)0-1
×3=0-4=-4;
(3)(-3
)×(+
)=-
×
=-2;
(4)(-18)×(
)-14×(-1
)=-15-14×(-
)=1;
(5)(
)×(+1
)×(-2
)×(-3
)=
×
×(-
)×(-
)=
.
2 |
3 |
5 |
3 |
(2)0-1
1 |
3 |
(3)(-3
1 |
3 |
3 |
5 |
10 |
3 |
3 |
5 |
(4)(-18)×(
5 |
6 |
1 |
7 |
8 |
7 |
(5)(
1 |
2 |
1 |
3 |
1 |
4 |
3 |
5 |
1 |
2 |
4 |
3 |
9 |
4 |
18 |
5 |
27 |
5 |
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