能简算的要简算(1)4.9÷710+3.7÷710-1.6÷710(2)40-15×(23+15)(3)98%×99+(1-1%)×2(4)89×[34-(716-0.25)](5)[154-(0.2+13)×4.5]÷0.125.-数学

题文

能简算的要简算
(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.
题型:解答题  难度:中档

答案

(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
×[
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