怎样算简便就怎样算．①85×0.75+15×75% ②1920×17-3
怎样算简便就怎样算．①85×0.75+15×75%②1920×17-35÷7③325×736×125×108④(512+19+38)×72．...
怎样算简便就怎样算．①85×0.75+15×75% ②1920×17-35÷7 ③325×736×125×108 ④(512+19+38) ×72．
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①85×0.75+15×75%
=85×0.75+15×0.75，
=（85+15）×0.75，
=100×0.75，
=75；
②
×
-
÷7
=
×
-
×
，
=（
-
）×
，
=
×
，
=
；
③
×
×125×108
=（
×125）×（
×108）
=15×21，
=315；
④(
+
+
) ×72．
=
×72+
×72+
×72，
=30+8+27，
=65．
=85×0.75+15×0.75，
=（85+15）×0.75，
=100×0.75，
=75；
②
| 19 |
| 20 |
| 1 |
| 7 |
| 3 |
| 5 |
=
| 19 |
| 20 |
| 1 |
| 7 |
| 12 |
| 20 |
| 1 |
| 7 |
=（
| 19 |
| 20 |
| 12 |
| 20 |
| 1 |
| 7 |
=
| 7 |
| 20 |
| 1 |
| 7 |
=
| 1 |
| 20 |
③
| 3 |
| 25 |
| 7 |
| 36 |
=（
| 3 |
| 25 |
| 7 |
| 36 |
=15×21，
=315；
④(
| 5 |
| 12 |
| 1 |
| 9 |
| 3 |
| 8 |
=
| 5 |
| 12 |
| 1 |
| 9 |
| 3 |
| 8 |
=30+8+27，
=65．
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