题目内容

神机妙算:
8.8-
7
9
-(0.8+
7
9
1
15
+
2
17
)×15×17.
25×
3
5
+2.75÷1
2
3
+60%
25×1.25×3299×(
9
11
-
3
8
)+
3
8
×99
101-99+98-97+96-95+94-93.
(1)8.8-
7
9
-(0.8+
7
9
),
=8.8-
7
9
-0.8-
7
9

=(8.8-0.8)-(
7
9
+
7
9
),
=8-1
5
9

=6
4
9


(2)(
1
15
+
2
17
)×15×17,
=(
1
15
+
2
17
)×(15×17),
=
1
15
×(15×17)+
2
17
×(15×17),
=(
1
15
×15)×17+(
2
17
×17)×15,
=1×17+2×15,
=17+30,
=47;

(3)25×
3
5
+2.75÷1
2
3
+60%,
=25×
3
5
+2.75×
3
5
+
3
5

=(25+2.75+1)×
3
5

=28.75×0.6,
=17.25;

(4)25×1.25×32,
=25×1.25×4×8,
=(25×4)×(1.25×8),
=100×10,
=1000;

(5)99×(
9
11
-
3
8
)+
3
8
×99,
=99×
9
11
-99×
3
8
+
3
8
×99,
=81-
3
8
×(99-99),
=81-
3
8
×0,
=81-0,
=81;

(6)101-99+98-97+96-95+94-93,
=(101-99)+(98-97)+(96-95)+(94-93),
=2+1+1+1,
=5.
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