
脱式计算(能简算的要简算)[1-(14+38)]÷14; 18×58+18×42;  ...
脱式计算(能简算的要简算)[1-(14+38)]÷14;18×58+18×42;59×6+49÷16....
脱式计算(能简算的要简算)[1-(14+38)]÷14; 18×58+18×42; 59×6+49÷16.
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(1)[1-(
+
)]÷
=[1-
]÷
=
×4
=
;
(2)
×58+
×42
=
×(58+42)
=
×100
=12.5;
(3)
×6+
÷
=
×6+
×6
=(
+
)×6
=1×6
=6.
1 |
4 |
3 |
8 |
1 |
4 |
=[1-
5 |
8 |
1 |
4 |
=
3 |
8 |
=
3 |
2 |
(2)
1 |
8 |
1 |
8 |
=
1 |
8 |
=
1 |
8 |
=12.5;
(3)
5 |
9 |
4 |
9 |
1 |
6 |
=
5 |
9 |
4 |
9 |
=(
5 |
9 |
4 |
9 |
=1×6
=6.
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