题目内容

计算下面各题,怎样简便就怎样计算.
11
8
×
7
9
+
7
9
×
7
18

②87×
3
86

1
4
×7
5
7
+3
2
7
×25%-
1
4

④(
7
5
-40%)÷
2
5
×
5
4
11
8
×
7
9
+
7
9
×
7
18

=(
11
18
+
7
18
)×
7
9

=1×
7
9

=
7
9


②87×
3
86

=(86+1)×
3
86

=86×
3
86
+
3
86

=3+
3
86

=3
3
86


1
4
×7
5
7
+3
2
7
×25%-
1
4

=
1
4
×7
5
7
+3
2
7
×
1
4
-
1
4

=(7
5
7
+3
2
7
-1)×
1
4

=10×
1
4

=
5
2


④(
7
5
-40%)÷
2
5
×
5
4

=(1.4-0.4)×
5
2
×
5
4

=1×
5
2
×
5
4

=
25
8
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