
计算下列各题,能用简便方法的用简便方法计算:(1)913×(23?19)  ...
计算下列各题,能用简便方法的用简便方法计算:(1)913×(23?19)(2)34×27+14×27(3)15×78÷78÷35(4)97×710+710+710×2....
计算下列各题,能用简便方法的用简便方法计算:(1)913×(23?19) (2)34×27+14×27(3)15×78÷78÷35 (4)97×710+710+710×2.
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(1)
×(
-
),
=
×
?
×
,
=
?
,
=
;
(2)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)15×
÷
÷35,
=15×
×
×
,
=
;
(4)97×
+
+
×2,
=(97+l+2)×
,
=100×
,
=70;
9 |
13 |
2 |
3 |
1 |
9 |
=
9 |
13 |
2 |
3 |
9 |
13 |
1 |
9 |
=
6 |
13 |
1 |
13 |
=
5 |
13 |
(2)
3 |
4 |
2 |
7 |
1 |
4 |
2 |
7 |
=(
3 |
4 |
1 |
4 |
2 |
7 |
=1×
2 |
7 |
=
2 |
7 |
(3)15×
7 |
8 |
7 |
8 |
=15×
7 |
8 |
8 |
7 |
1 |
35 |
=
3 |
7 |
(4)97×
7 |
10 |
7 |
10 |
7 |
10 |
=(97+l+2)×
7 |
10 |
=100×
7 |
10 |
=70;
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