题目内容
①(-3)×(-9)-8×(-5)
②-63÷7+45÷(-9)
③-3×22-(-3×2)3
④(-0.1)3-
(-
)2
⑤4
×[-9×(-
)2-0.8]÷(-5
)
⑥(-4
)-[(-4
)-(-3
)]
⑦-22-(-2)2+(-3)2×(-
)-42÷|-4|
⑧23-17-(-7)+(-16)
⑨(
-
+
-
)×(-36)
②-63÷7+45÷(-9)
③-3×22-(-3×2)3
④(-0.1)3-
| 3 |
| 4 |
| 3 |
| 5 |
⑤4
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
⑥(-4
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
⑦-22-(-2)2+(-3)2×(-
| 2 |
| 3 |
⑧23-17-(-7)+(-16)
⑨(
| 1 |
| 2 |
| 5 |
| 9 |
| 5 |
| 6 |
| 7 |
| 12 |
考点:有理数的混合运算
专题:
分析:①②按照有理数混合运算的顺序,先乘除后算加减;
③④⑤⑦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;
⑥先变形为-4
+4
-3
,再计算即可求解;
⑧先化简,再相加即可求解;
⑨运用乘法的分配律计算.
③④⑤⑦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;
⑥先变形为-4
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
⑧先化简,再相加即可求解;
⑨运用乘法的分配律计算.
解答:解:①(-3)×(-9)-8×(-5)
=27+40
=67;
②-63÷7+45÷(-9)
=-9-5
=-14;
③-3×22-(-3×2)3
=-3×4-(-6)3
=-12+216
=204;
④(-0.1)3-
(-
)2
=-0.001-
×
=-0.001-0.27
=-0.271;
⑤4
×[-9×(-
)2-0.8]÷(-5
)
=
×[-9×
-
]×(-
)
=
×[-1-
]×(-
)
=
×(-
)×(-
)
=
;
⑥(-4
)-[(-4
)-(-3
)]
=-4
+4
-3
=-3
;
⑦-22-(-2)2+(-3)2×(-
)-42÷|-4|
=-4-4+9×(-
)-16÷4
=-4-4-6-4
=-18;
⑧23-17-(-7)+(-16)
=23-17+7-16
=30-33
=-3;
⑨(
-
+
-
)×(-36)
=-18+20-30+21
=-48+41
=-7.
=27+40
=67;
②-63÷7+45÷(-9)
=-9-5
=-14;
③-3×22-(-3×2)3
=-3×4-(-6)3
=-12+216
=204;
④(-0.1)3-
| 3 |
| 4 |
| 3 |
| 5 |
=-0.001-
| 3 |
| 4 |
| 9 |
| 25 |
=-0.001-0.27
=-0.271;
⑤4
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 9 |
| 2 |
| 1 |
| 9 |
| 4 |
| 5 |
| 4 |
| 21 |
=
| 9 |
| 2 |
| 4 |
| 5 |
| 4 |
| 21 |
=
| 9 |
| 2 |
| 9 |
| 5 |
| 4 |
| 21 |
=
| 54 |
| 35 |
⑥(-4
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
=-4
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
=-3
| 2 |
| 3 |
⑦-22-(-2)2+(-3)2×(-
| 2 |
| 3 |
=-4-4+9×(-
| 2 |
| 3 |
=-4-4-6-4
=-18;
⑧23-17-(-7)+(-16)
=23-17+7-16
=30-33
=-3;
⑨(
| 1 |
| 2 |
| 5 |
| 9 |
| 5 |
| 6 |
| 7 |
| 12 |
=-18+20-30+21
=-48+41
=-7.
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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