计算下面各题,怎样简便就怎样算.(1)(709-4832÷16)×12 (2)98.3-3.32-5.68+11.7 &n...
计算下面各题,怎样简便就怎样算.(1)(709-4832÷16)×12(2)98.3-3.32-5.68+11.7(3)0.25×3.2×1.25(4)13÷[(23+1...
计算下面各题,怎样简便就怎样算.(1)(709-4832÷16)×12 (2)98.3-3.32-5.68+11.7 (3)0.25×3.2×1.25(4)13÷[(23+15)×113](5)(15-18)×5×8.
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(1)(709-4832÷16)×12,
=(709-302)×12,
=407×12,
=4884;
(2)98.3-3.32-5.68+11.7,
=(98.3+11.7)-(3.32+5.68),
=110-9,
=101;
(3)0.25×3.2×1.25,
=(0.25×4)×(0.8×1.25),
=1×1,
=1;
(4)
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=
×15,
=5;
(5)(
-
)×5×8,
=
×5×8-
×5×8,
=8-5,
=3.
=(709-302)×12,
=407×12,
=4884;
(2)98.3-3.32-5.68+11.7,
=(98.3+11.7)-(3.32+5.68),
=110-9,
=101;
(3)0.25×3.2×1.25,
=(0.25×4)×(0.8×1.25),
=1×1,
=1;
(4)
1 |
3 |
2 |
3 |
1 |
5 |
1 |
13 |
=
1 |
3 |
13 |
15 |
1 |
13 |
=
1 |
3 |
1 |
15 |
=
1 |
3 |
=5;
(5)(
1 |
5 |
1 |
8 |
=
1 |
5 |
1 |
8 |
=8-5,
=3.
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