计算:(1)-23÷49×(-23)2(2)[1-(1-0.5×13)]×[2-(-3)2].(3)-|-3+213|-|-13|2+(-13)2×(-1)9×(-2)3(4)-22×(-3.14)-

题目简介

计算:(1)-23÷49×(-23)2(2)[1-(1-0.5×13)]×[2-(-3)2].(3)-|-3+213|-|-13|2+(-13)2×(-1)9×(-2)3(4)-22×(-3.14)-

题目详情

计算:
(1)-23÷
4
9
×(-
2
3
2
(2)[1-(1-0.5×
1
3
)]×[2-(-3)2].
(3)-|-3+2
1
3
|-|-
1
3
|2+(-
1
3
2×(-1)9×(-2)3
(4)-22×(-3.14)-3.14×(-
1
2
)×(-6);
(5)(
7
4
-
7
8
-
7
12
)÷(-
7
8
)+(-
8
3
).
题型:解答题难度:中档来源:不详

答案

(1)-23÷class="stub"4
9
×(-class="stub"2
3
)2
=-8×class="stub"9
4
×class="stub"4
9

=-8;

(2)[1-(1-0.5×class="stub"1
3
)]×[2-(-3)2]
=[1-(1-class="stub"1
6
)]×[2-9]
=[1-class="stub"5
6
]×[-7]
=class="stub"1
6
×[-7]
=-class="stub"7
6


(3)-|-3+2class="stub"1
3
|-|-class="stub"1
3
|2+(-class="stub"1
3
)2×(-1)9×(-2)3
=-class="stub"2
3
-class="stub"1
9
+class="stub"1
9
×(-1)×(-8)
=-class="stub"2
3
-class="stub"1
9
+class="stub"8
9

=class="stub"1
9


(4)-22×(-3.14)-3.14×(-class="stub"1
2
)×(-6)
=-4×(-3.14)-3.14×3
=(4-3)×3.14
=1×3.14
=3.14;

(5)(class="stub"7
4
-class="stub"7
8
-class="stub"7
12
)÷(-class="stub"7
8
)+(-class="stub"8
3

=(class="stub"7
4
-class="stub"7
8
-class="stub"7
12
)×(-class="stub"8
7
)+(-class="stub"8
3

=(-class="stub"7
4
×class="stub"8
7
+class="stub"7
8
×class="stub"8
7
+class="stub"7
12
×class="stub"8
7
)+(-class="stub"8
3

=-2+1+class="stub"2
3
-class="stub"8
3

=-3.

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