计算:(1)(-212)+(+56)+(-12)+(+116);(2)(79-56+34-718)×36;(3)-23÷49×(-23)2+(-0.8)-5×(-122).-数学

题目简介

计算:(1)(-212)+(+56)+(-12)+(+116);(2)(79-56+34-718)×36;(3)-23÷49×(-23)2+(-0.8)-5×(-122).-数学

题目详情

计算:
(1)(-2
1
2
)+(+
5
6
)+(-
1
2
)+(+1
1
6
);
(2)(
7
9
-
5
6
+
3
4
-
7
18
)×36;
(3)-23÷
4
9
×(-
2
3
2+(-0.8)-5×(-
1
22
).
题型:解答题难度:中档来源:不详

答案

(1)(-2class="stub"1
2
)+(+class="stub"5
6
)+(-class="stub"1
2
)+(+1class="stub"1
6

=(-2class="stub"1
2
-class="stub"1
2
)+(class="stub"5
6
+1class="stub"1
6

=-3+2
=-1;

(2)(class="stub"7
9
-class="stub"5
6
+class="stub"3
4
-class="stub"7
18
)×36
=class="stub"7
9
×36-class="stub"5
6
×36+class="stub"3
4
×36-class="stub"7
18
×36
=28-30+27-14
=11;

(3)-23÷class="stub"4
9
×(-class="stub"2
3
)2+(-0.8)-5×(-class="stub"1
22

=-8×class="stub"9
4
×class="stub"4
9
-0.8+5×class="stub"1
4

=-8+0.8+1.25
=-7.55.

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