题目内容
简便计算
| 43×99+43 |
|
| ||||||||||||||
| 3.5×98+35×0.2 | 250×
|
|
(1)43×99+43,
=43×(99+1),
=43×100,
=4300;
(2)
-
+
-
,
=(
+
)-(
+
),
=1-1,
=0;
(3)
×
-
÷13,
=
×
-
×
,
=(
-
)×
,
=
×
,
=
;
(4)3.5×98+35×0.2,
=3.5×98+3.5×2,
=3.5×(98+2),
=3.5×100,
=350;
(5)250×
+250×
,
=250×(
+
),
=250×1,
=250;
(6)
×12.5×
×8,
=(
×
)×(12.5×8),
=
×100,
=330.
=43×(99+1),
=43×100,
=4300;
(2)
| 3 |
| 7 |
| 2 |
| 5 |
| 4 |
| 7 |
| 3 |
| 5 |
=(
| 3 |
| 7 |
| 4 |
| 7 |
| 2 |
| 5 |
| 3 |
| 5 |
=1-1,
=0;
(3)
| 5 |
| 12 |
| 1 |
| 13 |
| 1 |
| 4 |
=
| 5 |
| 12 |
| 1 |
| 13 |
| 1 |
| 4 |
| 1 |
| 13 |
=(
| 5 |
| 12 |
| 1 |
| 4 |
| 1 |
| 13 |
=
| 1 |
| 6 |
| 1 |
| 13 |
=
| 1 |
| 78 |
(4)3.5×98+35×0.2,
=3.5×98+3.5×2,
=3.5×(98+2),
=3.5×100,
=350;
(5)250×
| 1 |
| 5 |
| 4 |
| 5 |
=250×(
| 1 |
| 5 |
| 4 |
| 5 |
=250×1,
=250;
(6)
| 11 |
| 3 |
| 9 |
| 10 |
=(
| 11 |
| 3 |
| 9 |
| 10 |
=
| 33 |
| 10 |
=330.
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