
脱式计算,能简算的要用简便方法计算.1720×57+27×1720720÷[12×(23+45)]12×(14+16
脱式计算,能简算的要用简便方法计算.1720×57+27×1720720÷[12×(23+45)]12×(14+16)...
脱式计算,能简算的要用简便方法计算.1720×57+27×1720720÷[12×(23+45)]12×(14+16)
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(1)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(2)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
×
,
=
;
(3)12×(
+
),
=12×
+12×
,
=3+2,
=5.
17 |
20 |
5 |
7 |
2 |
7 |
17 |
20 |
=
17 |
20 |
5 |
7 |
2 |
7 |
=
17 |
20 |
=
17 |
20 |
(2)
7 |
20 |
1 |
2 |
2 |
3 |
4 |
5 |
=
7 |
20 |
1 |
2 |
22 |
15 |
=
7 |
20 |
11 |
15 |
=
7 |
20 |
15 |
11 |
=
21 |
44 |
(3)12×(
1 |
4 |
1 |
6 |
=12×
1 |
4 |
1 |
6 |
=3+2,
=5.
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