计算下面各题,能简算的就简算 9.6-7.8+2.438.8-(8.8-5.29)307×10.118.96-3.3×1.20.32×12.5×2.5(1

计算下面各题,能简算的就简算9.6-7.8+2.438.8-(8.8-5.29)307×10.118.96-3.3×1.20.32×12.5×2.5(125-1.25)×... 计算下面各题,能简算的就简算 9.6-7.8+2.438.8-(8.8-5.29)307×10.118.96-3.3×1.20.32×12.5×2.5(125-1.25)×0.89.9×3428.6×101-2.86×1074?47+382-23?712511?14?14+6111718?712+118. 展开
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(1)9.6-7.8+2.4
=9.6+2.4-7.8
=12-7.8
=4.2;

(2)38.8-(8.8-5.29)
=38.8-8.8+5.29
=30-5.29
=24.71;

(3)307×10.1
=307×(10+0.1)
=307×10+307×0.1
=3070+30.7
=3100.7;

(4)18.96-3.3×1.2
=18.96-3.96
=15;

(5)0.32×12.5×2.5
=0.4×0.8×12.5×2.5
=(0.4×2.5)×(0.8×12.5)
=1×10
=10;

(6)(125-1.25)×0.8
=125×0.8-1.25×0.8
=100-1
=99;

(7)9.9×34
=(10-0.1)×34
=10×34-0.1×34
=340-3.4
=336.6;

(8)28.6×101-2.86×10
=28.6×101-28.6×1
=28.6×(101-1)
=28.6×100
=2860;

(9)
7
4
-
4
7
+
3
8

=
33
28
+
3
8

=
87
56


(10)2-
2
3
?
7
12

=
4
3
-
7
12

=
3
4


(11)
5
11
-
1
4
-
1
4
+
6
11

=(
5
11
+
6
11
)-(
1
4
+
1
4

=1-
1
2

=
1
2


(12)
17
18
?
7
12
+
1
18

=(
17
18
+
1
18
)-
7
12

=1-
7
12

=
5
12
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