
用合适的方法计算下列各题.617×12×51 1÷(14÷15) 58×17+38×17 47×712÷49 36×(3-29
用合适的方法计算下列各题.617×12×511÷(14÷15)58×17+38×1747×712÷4936×(3-29)...
用合适的方法计算下列各题.617×12×51 1÷(14÷15) 58×17+38×17 47×712÷49 36×(3-29)
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(1)
×
×51,
=
×51×
,
=18×
,
=9;
(2)1÷(
÷
),
=1÷
,
=
;
(3)
×17+
×17,
=(
+
)×17,
=1×17,
=17;
(4)
×
÷
,
=
×
,
=
;
(5)36×(3-
),
=36×3-36×
,
=108-8,
=100.
6 |
17 |
1 |
2 |
=
6 |
17 |
1 |
2 |
=18×
1 |
2 |
=9;
(2)1÷(
1 |
4 |
1 |
5 |
=1÷
5 |
4 |
=
4 |
5 |
(3)
5 |
8 |
3 |
8 |
=(
5 |
8 |
3 |
8 |
=1×17,
=17;
(4)
4 |
7 |
7 |
12 |
4 |
9 |
=
1 |
3 |
9 |
4 |
=
3 |
4 |
(5)36×(3-
2 |
9 |
=36×3-36×
2 |
9 |
=108-8,
=100.
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