脱式计算(能简算的要简算)14×75-624÷39; 98×23.3-23.3÷8;  ...
脱式计算(能简算的要简算)14×75-624÷39;98×23.3-23.3÷8;19÷[(34+15)÷12]....
脱式计算(能简算的要简算)14×75-624÷39; 98×23.3-23.3÷8; 19÷[(34+15)÷12].
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(1)14×75-624÷39
=1050-16
=1034;
(2)
×23.3-23.3÷8
=
×23.3-23.3×
=(
-
)×23.3
=1×23.3
=23.3;
(3)19÷[(
+
)÷
]
=19÷[
÷
]
=19÷
=10.
=1050-16
=1034;
(2)
| 9 |
| 8 |
=
| 9 |
| 8 |
| 1 |
| 8 |
=(
| 9 |
| 8 |
| 1 |
| 8 |
=1×23.3
=23.3;
(3)19÷[(
| 3 |
| 4 |
| 1 |
| 5 |
| 1 |
| 2 |
=19÷[
| 19 |
| 20 |
| 1 |
| 2 |
=19÷
| 19 |
| 10 |
=10.
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