题目内容
用递等式计算(能简算的要简算)
(1)2842÷14+74×3;
(2)
+
-
+
;
(3)88+99×88;
(4)(
+
)÷
+
.
(1)2842÷14+74×3;
(2)
| 3 |
| 7 |
| 5 |
| 13 |
| 3 |
| 7 |
| 5 |
| 13 |
(3)88+99×88;
(4)(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
(1)2842÷14+74×3,
=203+222,
=425;
(2)
+
-
+
,
=(
-
)+(
+
),
=0+
,
=
;
(3)88+99×88,
=88×(1+99),
=88×100,
=8800;
(4)(
+
)÷
+
,
=
×
+
,
=
+
,
=
.
=203+222,
=425;
(2)
| 3 |
| 7 |
| 5 |
| 13 |
| 3 |
| 7 |
| 5 |
| 13 |
=(
| 3 |
| 7 |
| 3 |
| 7 |
| 5 |
| 13 |
| 5 |
| 13 |
=0+
| 10 |
| 13 |
=
| 10 |
| 13 |
(3)88+99×88,
=88×(1+99),
=88×100,
=8800;
(4)(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
=
| 21 |
| 20 |
| 3 |
| 7 |
| 7 |
| 10 |
=
| 9 |
| 20 |
| 14 |
| 20 |
=
| 23 |
| 20 |
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