
计算下面各题,怎样计算简便就怎样计算. 2-(29+518) 15+38+45+58 89-23+13 0.125×32×25
计算下面各题,怎样计算简便就怎样计算.2-(29+518)15+38+45+5889-23+130.125×32×25....
计算下面各题,怎样计算简便就怎样计算. 2-(29+518) 15+38+45+58 89-23+13 0.125×32×25.
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(1)2-(
+
),
=2-
,
=1
;
(2)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(3)
-
+
,
=
-(
-
),
=
-
,
=
;
(4)0.125×32×25,
=0.125×8×4×25,
=(0.125×8)×(4×25),
=1×100,
=100.
2 |
9 |
5 |
18 |
=2-
1 |
2 |
=1
1 |
2 |
(2)
1 |
5 |
3 |
8 |
4 |
5 |
5 |
8 |
=(
1 |
5 |
4 |
5 |
3 |
8 |
5 |
8 |
=1+1,
=2;
(3)
8 |
9 |
2 |
3 |
1 |
3 |
=
8 |
9 |
2 |
3 |
1 |
3 |
=
8 |
9 |
1 |
3 |
=
5 |
9 |
(4)0.125×32×25,
=0.125×8×4×25,
=(0.125×8)×(4×25),
=1×100,
=100.
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