问题 解答题
计算:
(1)-22+3×(-1)2010-|-4|×5;
(2)-3-[-5+(1-2×
3
5
)÷(-2)]

(3)-52×
3
4
+25×
1
2
-25×
1
4

(4)4
2
3
+2
1
5
-0.8+2
4
5
-(-6
1
3
)
答案

(1)-22+3×(-1)2010-|-4|×5

=-4+3×1-4×5

=-4+3-20

=-21;

(2)-3-[-5+(1-2×

3
5
)÷(-2)]

=-3-[-5+(1-

6
5
)÷(-2)]

=-3-[-5+(-

1
5
)÷(-2)]

=-3-[-5+

1
10
]

=-3+4

9
10

=1

9
10

(3)-52×

3
4
+25×
1
2
-25×
1
4

=-25×

3
4
+25×
1
2
-25×
1
4

=25×(-

3
4
+
1
2
-
1
4

=25×(-

1
2

=-12.5;

(4)4

2
3
+2
1
5
-0.8+2
4
5
-(-6
1
3
)

=(4

2
3
+6
1
3
)+(2
1
5
+2
4
5
)-0.8

=11+5-0.8

=15.2.

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