题目内容
能简算的要简算
(1)4.9÷
+3.7÷
-1.6÷
(2)40-15×(
+
)
(3)98%×99+(1-1%)×2
(4)
×[
-(
-0.25)]
(5)[
-(0.2+
)×4.5]÷0.125.
(1)4.9÷
| 7 |
| 10 |
| 7 |
| 10 |
| 7 |
| 10 |
(2)40-15×(
| 2 |
| 3 |
| 1 |
| 5 |
(3)98%×99+(1-1%)×2
(4)
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
(5)[
| 15 |
| 4 |
| 1 |
| 3 |
(1)4.9÷
+3.7÷
-1.6÷
,
=4.9×
+3.7×
-1.6×
,
=(4.9+3.7-1.6)×
,
=(8.6-1.6)×
,
=7×
,
=10;
(2)40-15×(
+
),
=40-15×
-15×
,
=40-10-3,
=30-3,
=27;
(3)98%×99+(1-1%)×2,
=98×99%+99%×2,
=(98+2)×99%,
=100×99%,
=99;
(4)
×[
-(
-0.25)],
=
×[
-
+
],
=
×[1-
],
=
×
,
=
;
(5)[
-(0.2+
)×4.5]÷0.125,
=[
-0.2×4.5-
×4.5]÷0.125,
=[
-0.9-1.5]÷0.125,
=1.35÷0.125,
=1.08.
| 7 |
| 10 |
| 7 |
| 10 |
| 7 |
| 10 |
=4.9×
| 10 |
| 7 |
| 10 |
| 7 |
| 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 |
| 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 |
=
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 8 |
| 9 |
| 7 |
| 16 |
=
| 8 |
| 9 |
| 9 |
| 16 |
=
| 1 |
| 2 |
(5)[
| 15 |
| 4 |
| 1 |
| 3 |
=[
| 15 |
| 4 |
| 1 |
| 3 |
=[
| 15 |
| 4 |
=1.35÷0.125,
=1.08.
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