题目内容

我能很快算出下面的题目相信你也能行.
①9
2
5
-(3
3
7
+0.4)
②7.8×
1
5
+2.2×20%
③34.7-
7
15
+65.3-
8
15
④(
3
4
+
11
6
-
13
24
)×12
⑤0.25×32×12.5
7
12
×[
3
4
-(
11
20
-
1
2
)]
1
3
x+
5
9
x=1.4 
⑧16:x=0.75:
15
8
①9
2
5
-(3
3
7
+0.4),
=9
2
5
-3
3
7
-
2
5

=(9
2
5
-
2
5
)-3
3
7

=9-3
3
7

=5
4
7


②7.8×
1
5
+2.2×20%,
=7.8×0.2+2.2×0.2,
=(7.8+2.2)×0.2,
=10×0.2,
=2;

③34.7-
7
15
+65.3-
8
15

=(34.7+65.3)-(
7
15
+
8
15
),
=100-1,
=99;

④(
3
4
+
11
6
-
13
24
)×12,
=
3
4
×12+
11
6
×12-
13
24
×12,
=9+22-6.5,
=24.5;

⑤0.25×32×12.5,
=0.25×4×8×12.5,
=(0.25×4)×(8×12.5),
=1×100,
=100;

7
12
×[
3
4
-(
11
20
-
1
2
)],
=
7
12
×[
3
4
-(
11
20
-
10
20
)],
=
7
12
×[
3
4
-
1
20
],
=
7
12
×[
15
20
-
1
20
],
=
7
12
×
7
10

=
49
120


1
3
x+
5
9
x=1.4,
1
3
+
5
9
)x=1.4,
8
9
x=1.4,
8
9
9
8
=1.4×
9
8

x=
63
40


⑧16:x=0.75:
15
8

0.75x=16×
15
8

0.75x=30,
0.75x÷0.75=30÷0.75,
x=40.
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