题目内容
计算:
(1)2.52×[5
-1.75×(
+
)]
(2)(
+
+
)÷(
+
)-
(3)[15.5-(1.5×
+1
×
)]÷14%
(4)[1
+2
÷(3
-1.125)]×
-
.
(1)2.52×[5
| 1 |
| 2 |
| 2 |
| 3 |
| 19 |
| 21 |
(2)(
| 1 |
| 143 |
| 1 |
| 77 |
| 1 |
| 91 |
| 20 |
| 99 |
| 1 |
| 9 |
| 2 |
| 91 |
(3)[15.5-(1.5×
| 5 |
| 7 |
| 1 |
| 2 |
| 2 |
| 7 |
(4)[1
| 1 |
| 10 |
| 7 |
| 20 |
| 1 |
| 12 |
| 9 |
| 23 |
| 1 |
| 6 |
(1)2.52×[5
-1.75×(
+
)],
=
×[5
-
×
],
=
×[5
-
],
=
×
,
=
,
=6.93;
(2)(
+
+
)÷(
+
)-
,
=(
+
+
)÷(
+
)-
,
=
÷
-
,
=
×
-
,
=
-
,
=
;
(3)[15.5-(1.5×
+1
×
)]÷14%,
=[15.5-(1.5×
+1.5×
)]÷0.14,
=[15.5-1.5×(
+
)]÷0.14,
=[15.5-1.5×1]÷0.14,
=14÷0.14,
=100;
(4)[1
+2
÷(3
-1.125)]×
-
,
=[1
+2
÷(3
-1
)]×
-
,
=[1
+2
÷
]×
-
,
=[1
+
×
]×
-
,
=[1
+
]×
-
,
=
×
-
,
=
-
,
=
.
| 1 |
| 2 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 63 |
| 25 |
| 1 |
| 2 |
| 7 |
| 4 |
| 11 |
| 7 |
=
| 63 |
| 25 |
| 1 |
| 2 |
| 11 |
| 4 |
=
| 63 |
| 25 |
| 11 |
| 4 |
=
| 693 |
| 100 |
=6.93;
(2)(
| 1 |
| 143 |
| 1 |
| 77 |
| 1 |
| 91 |
| 20 |
| 99 |
| 1 |
| 9 |
| 2 |
| 91 |
=(
| 1 |
| 11×13 |
| 1 |
| 7×11 |
| 1 |
| 7×13 |
| 20 |
| 99 |
| 11 |
| 99 |
| 2 |
| 91 |
=
| 7+13+11 |
| 7×11×13 |
| 31 |
| 99 |
| 2 |
| 91 |
=
| 31 |
| 7×11×13 |
| 99 |
| 31 |
| 2 |
| 91 |
=
| 9 |
| 91 |
| 2 |
| 91 |
=
| 1 |
| 13 |
(3)[15.5-(1.5×
| 5 |
| 7 |
| 1 |
| 2 |
| 2 |
| 7 |
=[15.5-(1.5×
| 5 |
| 7 |
| 2 |
| 7 |
=[15.5-1.5×(
| 5 |
| 7 |
| 2 |
| 7 |
=[15.5-1.5×1]÷0.14,
=14÷0.14,
=100;
(4)[1
| 1 |
| 10 |
| 7 |
| 20 |
| 1 |
| 12 |
| 9 |
| 23 |
| 1 |
| 6 |
=[1
| 1 |
| 10 |
| 7 |
| 20 |
| 1 |
| 12 |
| 1 |
| 8 |
| 9 |
| 23 |
| 1 |
| 6 |
=[1
| 1 |
| 10 |
| 7 |
| 20 |
| 47 |
| 24 |
| 9 |
| 23 |
| 1 |
| 6 |
=[1
| 1 |
| 10 |
| 47 |
| 20 |
| 24 |
| 47 |
| 9 |
| 23 |
| 1 |
| 6 |
=[1
| 1 |
| 10 |
| 6 |
| 5 |
| 9 |
| 23 |
| 1 |
| 6 |
=
| 23 |
| 10 |
| 9 |
| 23 |
| 1 |
| 6 |
=
| 9 |
| 10 |
| 1 |
| 6 |
=
| 11 |
| 15 |
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