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11
1
4
×7
1
9
-7
1
9
×2
1
4
+7
1
9

19
83
×668+
64
83
×666

③0.25×32×0.125       
1
6
+
1
12
+
1
20
+
1
30
+
1
42
+
1
56
+
1
72
+
1
90
+
1
110

11
1
4
×7
1
9
-7
1
9
×2
1
4
+7
1
9

=(11
1
4
-2
1
4
+1
)×7
1
9

=10×7
1
9

=10×(7+
1
9
),
=10×7+10×
1
9

=70+1
1
9

=71
1
9


19
83
×668+
64
83
×666

=
19
83
×(666+2)+
64
83
×666,
=
19
83
×666+
19
83
×2+
64
83
×666,
=(
19
83
+
64
83
)×666+
19
83
×2,
=1×666+
38
83

=666
38
83


③0.25×32×0.125,
=0.25×(4×8)×0.125,
=(0.25×4)×(8×0.125),
=1×1,
=1;

1
6
+
1
12
+
1
20
+
1
30
+
1
42
+
1
56
+
1
72
+
1
90
+
1
110

=
1
2×3
+
1
3×4
+
1
4×5
+
1
5×6
+
1
6×7
+
1
7×8
+
1
8×9
+
1
9×10
+
1
10×11

=
1
2
-
1
3
+
1
3
-
1
4
+
1
4
-
1
5
+
1
5
-
1
6
+
1
6
-
1
7
+
1
7
-
1
8
+
1
8
-
1
9
+
1
9
-
1
10
+
1
10
-
1
11

=
1
2
-
1
11

=
9
22
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