题目内容
用递等式计算.
6.8×10.4-0.4×6.8
196×15÷(104-76)
1÷[
×(
-
)].
6.8×10.4-0.4×6.8
196×15÷(104-76)
1÷[
| 1 |
| 2 |
| 6 |
| 5 |
| 7 |
| 10 |
(1)6.8×10.4-0.4×6.8
=(10.4-0.4)×6.8,
=10×6.8,
=68;
(2)196×15÷(104-76)
=196×15÷28,
=196÷28×15,
=7×15,
=105;
(3)1÷[
×(
-
)]
=1÷[
×(
-
)],
=1÷[
×
],
=1÷
,
=1×4,
=4.
=(10.4-0.4)×6.8,
=10×6.8,
=68;
(2)196×15÷(104-76)
=196×15÷28,
=196÷28×15,
=7×15,
=105;
(3)1÷[
| 1 |
| 2 |
| 6 |
| 5 |
| 7 |
| 10 |
=1÷[
| 1 |
| 2 |
| 12 |
| 10 |
| 7 |
| 10 |
=1÷[
| 1 |
| 2 |
| 1 |
| 2 |
=1÷
| 1 |
| 4 |
=1×4,
=4.
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