下面各题,怎样算简便就怎样算. 4×0.8×2.5×1.25[(79+13)÷815]×3101-
下面各题,怎样算简便就怎样算.4×0.8×2.5×1.25[(79+13)÷815]×3101-(712-12)×398+99×98(229+1110)×9114.2-1...
下面各题,怎样算简便就怎样算. 4×0.8×2.5×1.25[(79+13)÷815]×3101-(712-12)×398+99×98(229+1110)×9114.2-1.38+5.8-3.62.
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(1)4×0.8×2.5×1.25,
=(4×2.5)×(0.8×1.25),
=10×1,
=10;
(2)[(
+
)÷
]×
,
=[
×
]×
,
=
×
×
,
=
;
(3)1-(
-
)×3,
=1-
×3,
=1-
,
=
;
(4)98+99×98,
=(1+99)×98,
=100×98,
=9800;
(5)(
+
)×
,
=
×
+
×
,
=2+
,
=2
;
(6)4.2-1.38+5.8-3.62,
=(4.2+5.8)-(1.38+3.62),
=10-5,
=5.
=(4×2.5)×(0.8×1.25),
=10×1,
=10;
(2)[(
7 |
9 |
1 |
3 |
8 |
15 |
3 |
10 |
=[
10 |
9 |
15 |
8 |
3 |
10 |
=
10 |
9 |
15 |
8 |
3 |
10 |
=
5 |
8 |
(3)1-(
7 |
12 |
1 |
2 |
=1-
1 |
12 |
=1-
1 |
4 |
=
3 |
4 |
(4)98+99×98,
=(1+99)×98,
=100×98,
=9800;
(5)(
22 |
9 |
11 |
10 |
9 |
11 |
=
22 |
9 |
9 |
11 |
11 |
10 |
9 |
11 |
=2+
9 |
10 |
=2
9 |
10 |
(6)4.2-1.38+5.8-3.62,
=(4.2+5.8)-(1.38+3.62),
=10-5,
=5.
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