题目内容
计算:
(1)-0.5+(-15)-(-17)-
(2)-1
+8
-2
-3
(3)(
-3+
-
)÷(-
)
(4)-1.6÷[(-
)2×(-3)3-22]
(5)(-
)×(-3
)÷(-
)÷3;
(6)-33÷(-1
)2×
-|-22-4|×(-1)10.
(1)-0.5+(-15)-(-17)-
|
(2)-1
| 1 |
| 3 |
| 5 |
| 6 |
| 2 |
| 3 |
| 1 |
| 6 |
(3)(
| 1 |
| 2 |
| 5 |
| 6 |
| 7 |
| 12 |
| 1 |
| 36 |
(4)-1.6÷[(-
| 2 |
| 3 |
(5)(-
| 3 |
| 5 |
| 1 |
| 2 |
| 3 |
| 5 |
(6)-33÷(-1
| 1 |
| 2 |
| 4 |
| 9 |
分析:(1)先算绝对值,再计算即可求解;
(2)先算同分母分数,再相加;
(3)运用乘法的分配律计算;
(4)(6)按照有理数混合运算的顺序,先乘方后乘除最后算加减,有括号的先算括号里面的;
(5)约分计算即可.
(2)先算同分母分数,再相加;
(3)运用乘法的分配律计算;
(4)(6)按照有理数混合运算的顺序,先乘方后乘除最后算加减,有括号的先算括号里面的;
(5)约分计算即可.
解答:解:(1)-0.5+(-15)-(-17)-
=-0.5-15+17-12,
=-10.5;
(2)-1
+8
-2
-3
=(-1
-2
)+(8
-3
)
=-4+5
=1
;
(3)(
-3+
-
)÷(-
)
=(
-3+
-
)×(-36)
=-
×36+3×36-
×36+
×36
=-18+108-30+21
=81;
(4)-1.6÷[(-
)2×(-3)3-22]
=1.6÷[
×(-27)-4]
=1.6÷[-12-4]
=1.6÷[-16]
=-0.1;
(5)(-
)×(-3
)÷(-
)÷3
=(-
)×(-
)×(-
)×
=-
;
(6)-33÷(-1
)2×
-|-22-4|×(-1)10.
=-27×
×
-|-4-4|×1
=-
-8×1
=-
-8
=-13
.
|
=-0.5-15+17-12,
=-10.5;
(2)-1
| 1 |
| 3 |
| 5 |
| 6 |
| 2 |
| 3 |
| 1 |
| 6 |
=(-1
| 1 |
| 3 |
| 2 |
| 3 |
| 5 |
| 6 |
| 1 |
| 6 |
=-4+5
| 2 |
| 3 |
=1
| 2 |
| 3 |
(3)(
| 1 |
| 2 |
| 5 |
| 6 |
| 7 |
| 12 |
| 1 |
| 36 |
=(
| 1 |
| 2 |
| 5 |
| 6 |
| 7 |
| 12 |
=-
| 1 |
| 2 |
| 5 |
| 6 |
| 7 |
| 12 |
=-18+108-30+21
=81;
(4)-1.6÷[(-
| 2 |
| 3 |
=1.6÷[
| 4 |
| 9 |
=1.6÷[-12-4]
=1.6÷[-16]
=-0.1;
(5)(-
| 3 |
| 5 |
| 1 |
| 2 |
| 3 |
| 5 |
=(-
| 3 |
| 5 |
| 7 |
| 2 |
| 5 |
| 3 |
| 1 |
| 3 |
=-
| 7 |
| 6 |
(6)-33÷(-1
| 1 |
| 2 |
| 4 |
| 9 |
=-27×
| 4 |
| 9 |
| 4 |
| 9 |
=-
| 16 |
| 3 |
=-
| 16 |
| 3 |
=-13
| 1 |
| 3 |
点评:本题考查的是有理数的运算能力.注意:
(1)要正确掌握运算顺序,在混合运算中要特别注意运算顺序:先三级,后二级,再一级;有括号的先算括号里面的;同级运算按从左到右的顺序;
(2)去括号法则:--得+,-+得-,++得+,+-得-.
(1)要正确掌握运算顺序,在混合运算中要特别注意运算顺序:先三级,后二级,再一级;有括号的先算括号里面的;同级运算按从左到右的顺序;
(2)去括号法则:--得+,-+得-,++得+,+-得-.
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