题目内容
怎样简便怎样算:
| (
| ||||||||||||||||||
| 1994×19931994-1993×19941994 | (20.2×0.4+7.88)÷4.2. |
(1)
÷2
-1
×
÷7+
×
,
=
×
-
×
×
+
×
,
=
×
-
×
+
×
,
=(
+
)×
-
,
=
×
-
,
=
-
,
=
;
(2)(
-
+
)×60,
=
×60-
×60+
×60,
=48-10+25,
=38+25,
=63;
(3)1994×19931994-1993×19941994,
=1994×19931994-1993×1994×10001,
=1994×19931994-1994×19931993,
=1994×(19931994-19931993),
=1994×1,
=1994;
(4)(20.2×0.4+7.88)÷4.2,
=(20.2×0.4+7.88)÷4.2,
=(8.08+7.88)÷4.2,
=15.96÷4.2,
=3.8.
| 10 |
| 13 |
| 19 |
| 22 |
| 2 |
| 5 |
| 11 |
| 13 |
| 1 |
| 5 |
| 22 |
| 63 |
=
| 10 |
| 13 |
| 22 |
| 63 |
| 7 |
| 5 |
| 11 |
| 13 |
| 1 |
| 7 |
| 1 |
| 5 |
| 22 |
| 63 |
=
| 10 |
| 13 |
| 22 |
| 63 |
| 1 |
| 5 |
| 11 |
| 13 |
| 1 |
| 5 |
| 22 |
| 63 |
=(
| 10 |
| 13 |
| 1 |
| 5 |
| 22 |
| 63 |
| 11 |
| 65 |
=
| 63 |
| 65 |
| 22 |
| 63 |
| 11 |
| 65 |
=
| 22 |
| 65 |
| 11 |
| 65 |
=
| 11 |
| 65 |
(2)(
| 4 |
| 5 |
| 1 |
| 6 |
| 5 |
| 12 |
=
| 4 |
| 5 |
| 1 |
| 6 |
| 5 |
| 12 |
=48-10+25,
=38+25,
=63;
(3)1994×19931994-1993×19941994,
=1994×19931994-1993×1994×10001,
=1994×19931994-1994×19931993,
=1994×(19931994-19931993),
=1994×1,
=1994;
(4)(20.2×0.4+7.88)÷4.2,
=(20.2×0.4+7.88)÷4.2,
=(8.08+7.88)÷4.2,
=15.96÷4.2,
=3.8.
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