用递等式计算:(1)1042-384÷16×13(2)4.1-2.56÷(0.18+0.62)(3)2
用递等式计算:(1)1042-384÷16×13(2)4.1-2.56÷(0.18+0.62)(3)23-34×411+13÷37(4)3.14×43+7.2×31.4-...
用递等式计算:(1)1042-384÷16×13(2)4.1-2.56÷(0.18+0.62)(3)23-34×411+13÷37(4)3.14×43+7.2×31.4-150×0.314.
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(1)1042-384÷16×13,
=1042-24×13,
=1042-312,
=730;
(2)4.1-2.56÷(0.18+0.62),
=4.1-2.56÷0.8,
=4.1-3.2,
=0.9;
(3)
-
×
+
÷
,
=
-
+
×
,
=
?
+
,
=1
;
(4)3.14×43+7.2×31.4-150×0.314,
=3.14×43+72×3.14-15×3.14
=(43+72-15)×3.14,
=100×3.14,
=314.
=1042-24×13,
=1042-312,
=730;
(2)4.1-2.56÷(0.18+0.62),
=4.1-2.56÷0.8,
=4.1-3.2,
=0.9;
(3)
2 |
3 |
3 |
4 |
4 |
11 |
1 |
3 |
3 |
7 |
=
2 |
3 |
3 |
11 |
1 |
3 |
7 |
3 |
=
2 |
3 |
3 |
11 |
7 |
9 |
=1
17 |
99 |
(4)3.14×43+7.2×31.4-150×0.314,
=3.14×43+72×3.14-15×3.14
=(43+72-15)×3.14,
=100×3.14,
=314.
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