能簡(jiǎn)算的要簡(jiǎn)算
(1)4.9÷
7
10
+3.7÷
7
10
-1.6÷
7
10

(2)40-15×(
2
3
+
1
5
)

(3)98%×99+(1-1%)×2
(4)
8
9
×[
3
4
-(
7
16
-0.25)]

(5)[
15
4
-(0.2+
1
3
)×4.5]÷0.125
(1)4.9÷
7
10
+3.7÷
7
10
-1.6÷
7
10
,
=4.9×
10
7
+3.7×
10
7
-1.6×
10
7
,
=(4.9+3.7-1.6)×
10
7
,
=(8.6-1.6)×
10
7

=7×
10
7
,
=10;

(2)40-15×(
2
3
+
1
5
)
,
=40-15×
2
3
-15×
1
5
,
=40-10-3,
=30-3,
=27;

(3)98%×99+(1-1%)×2,
=98×99%+99%×2,
=(98+2)×99%,
=100×99%,
=99;

(4)
8
9
×[
3
4
-(
7
16
-0.25)]
,
=
8
9
×[
3
4
-
7
16
+
1
4
],
=
8
9
×[1-
7
16
],
=
8
9
×
9
16

=
1
2
;

(5)[
15
4
-(0.2+
1
3
)×4.5]÷0.125
,
=[
15
4
-0.2×4.5-
1
3
×4.5]÷0.125,
=[
15
4
-0.9-1.5]÷0.125,
=1.35÷0.125,
=1.08.
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