题目内容
能用简便方法的用简便方法.
(1)6502+672÷28×17
(2)3.4×2.79+0.21×3.4
(3)(
+
+
)×72
(4)[(
-
)÷
]÷
.
(1)6502+672÷28×17
(2)3.4×2.79+0.21×3.4
(3)(
| 5 |
| 12 |
| 1 |
| 9 |
| 3 |
| 8 |
(4)[(
| 1 |
| 2 |
| 1 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
(1)6502+672÷28×17,
=6502+24×17,
=6502+408,
=6910;
(2)3.4×2.79+0.21×3.4,
=3.4×(2.79+0.21),
=3.4×3,
=10.2;
(3)(
+
+
)×72,
=
×72+
×72+
×72,
=30+8+27,
=38+27,
=65;
(4)[(
-
)÷
]÷
,
=[
÷
]÷
,
=
÷
,
=
.
=6502+24×17,
=6502+408,
=6910;
(2)3.4×2.79+0.21×3.4,
=3.4×(2.79+0.21),
=3.4×3,
=10.2;
(3)(
| 5 |
| 12 |
| 1 |
| 9 |
| 3 |
| 8 |
=
| 5 |
| 12 |
| 1 |
| 9 |
| 3 |
| 8 |
=30+8+27,
=38+27,
=65;
(4)[(
| 1 |
| 2 |
| 1 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
=[
| 3 |
| 10 |
| 3 |
| 4 |
| 3 |
| 5 |
=
| 2 |
| 5 |
| 3 |
| 5 |
=
| 2 |
| 3 |
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