计算下面各题,能用简便方法的要用简便计算.2.5×(2.9+2.9+2.9+2.9)(23?59×38)÷716(16+19?112)×364÷49?49÷16.
(1)2.5×(2.9+2.9+2.9+2.9),
=2.5×4×2.9,
=10×2.9,
=29;
(2)(
-
×
)÷
,
=(
-
)÷
,
=
÷
,
=1
;
(3)(
+
-
)×36,
=
×36+
×36-
×36,
=6+4-3,
=10-3,
=7;
(4)4÷
-
÷16,
=9-
,
=8
.
=2.5×4×2.9,
=10×2.9,
=29;
(2)(
2 |
3 |
5 |
9 |
3 |
8 |
7 |
16 |
=(
2 |
3 |
5 |
24 |
7 |
16 |
=
11 |
24 |
7 |
16 |
=1
1 |
21 |
(3)(
1 |
6 |
1 |
9 |
1 |
12 |
=
1 |
6 |
1 |
9 |
1 |
12 |
=6+4-3,
=10-3,
=7;
(4)4÷
4 |
9 |
4 |
9 |
=9-
1 |
36 |
=8
35 |
36 |
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