题目内容

计算:
①-
1
4
+
5
6
-
3
4
+
1
6

②(2×3×4×5)×(
1
2
﹢
1
3
﹢
1
4
﹢
1
5
)
③25×
3
4
-(-25)×
1
2
﹢25×(-
1
4
)
④(-0.5)+3
3
4
+2.75+(-5
1
2
)
⑤(
1
3
-
3
5
﹢
3
10
)÷(-
7
30
)
①原式=-
1
4
-
3
4
+
5
6
+
1
6

=-1+1
=0;

②原式=2×3×4×5×
1
2
+2×3×4×5×
1
3
+2×3×4×5×
1
4
+2×3×4×5×
1
5

=60+40+30+24
=154;

③原式=25×
3
4
+25×
1
2
+25×(-
1
4
)
=25×(
3
4
+
1
2
-
1
4
)
=25×1
=25;  

④原式=(-0.5)+3.75+2.75+(-5.5)
=-6+6.5
=0.5;

⑤原式=(
1
3
-
3
5
+
3
10
)×(-
30
7
)
=
1
3
×(-
30
7
)-
3
5
×(-
30
7
)+
3
10
×(-
30
7
)
=-
10
7
+
18
7
-
9
7

=-
1
7
.
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