计算题:(1)312+(-12)-(-13)+223(2)(23-14-38+524)×48(3)-18÷(-3)2+5×(-12)2-(-15)÷5(4)[-38-(-1)7+(-3)8]×[-52

题目简介

计算题:(1)312+(-12)-(-13)+223(2)(23-14-38+524)×48(3)-18÷(-3)2+5×(-12)2-(-15)÷5(4)[-38-(-1)7+(-3)8]×[-52

题目详情

计算题:
(1)3
1
2
+(-
1
2
)-(-
1
3
)+2
2
3

(2)(
2
3
-
1
4
-
3
8
+
5
24
)×48

(3)-18÷(-3)2+5×(-
1
2
)2
-(-15)÷5
(4)[-38-(-1)7+(-3)8]×[-52].
题型:解答题难度:中档来源:不详

答案

(1)3class="stub"1
2
+(-class="stub"1
2
)-(-class="stub"1
3
)+2class="stub"2
3

=(3class="stub"1
2
-class="stub"1
2
)+(class="stub"1
3
+2class="stub"2
3

=3+3
=6;

(2)(class="stub"2
3
-class="stub"1
4
-class="stub"3
8
+class="stub"5
24
)×48

=32-12-18+10
=42-30
=12;

(3)-18÷(-3)2+5×(-class="stub"1
2
)2
-(-15)÷5
=-18÷9+5×class="stub"1
4
+3
=-2+1.25+3
=2.25;

(4)[-38-(-1)7+(-3)8]×[-52]
=[-38+38+1]×(-25)
=1×(-25)
=-25.

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