题目内容
计算
①5.2×1
+2
÷
②2
-(
+
+
)
③[3.75-(
+
)×4
]÷
④
÷(0.6×1.25+1
+
)
⑤(7
×2+7
+7
)÷4
⑥
⑦(
×4.27+8.54×
)÷4.27×25%
⑧1
+3
+5
+7
+9
.
①5.2×1
| 1 |
| 4 |
| 4 |
| 5 |
| 4 |
| 5 |
②2
| 5 |
| 8 |
| 2 |
| 3 |
| 1 |
| 4 |
| 5 |
| 6 |
③[3.75-(
| 1 |
| 5 |
| 1 |
| 3 |
| 1 |
| 2 |
| 3 |
| 5 |
④
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 4 |
⑤(7
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
⑥
9
| ||||||
9
|
⑦(
| 14 |
| 35 |
| 21 |
| 30 |
⑧1
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
①5.2×1
+2
÷
=5.2×
+2.8×
,
=(5.2+2.8)×
,
=8×
,
=10;
②2
-(
+
+
),
=2
-(
+
+
)
=2
-1
,
=
;
③[3.75-(
+
)×4
]÷
,
=[3.75-
×
]÷
=[3.75-2.4]÷0.6,
=1.35÷0.6,
=2.25;
④
÷(0.6×1.25+1
+
),
=
÷(
×
+1
+
),
=
÷(
+
+1
)
=
×
,
=
;
⑤(7
×2+7
+7
)÷4,
=7
×(2+1+1)÷4
=7
×4÷4,
=7
;
⑥
,
=
,
=
,
=1;
⑦(
×4.27+8.54×
)÷4.27×25%,
=(0.4×4.27+8.54×0.7)÷4.27×0.25,
=(1.708+5.978)×0.25÷4.27,
=7.686×0.25÷4.27,
=1.9215÷4.27,
=0.45;
⑧1
+3
+5
+7
+9
,
=(1+3+5+7+9)+(
+
+
+
+
),
=25+(
-
+
-
+
-
+
-
+
-
),
=25+(
-
),
=25+
,
=25
.
| 1 |
| 4 |
| 4 |
| 5 |
| 4 |
| 5 |
=5.2×
| 5 |
| 4 |
| 5 |
| 4 |
=(5.2+2.8)×
| 5 |
| 4 |
=8×
| 5 |
| 4 |
=10;
②2
| 5 |
| 8 |
| 2 |
| 3 |
| 1 |
| 4 |
| 5 |
| 6 |
=2
| 5 |
| 8 |
| 8 |
| 12 |
| 3 |
| 12 |
| 10 |
| 12 |
=2
| 5 |
| 8 |
| 3 |
| 4 |
=
| 7 |
| 8 |
③[3.75-(
| 1 |
| 5 |
| 1 |
| 3 |
| 1 |
| 2 |
| 3 |
| 5 |
=[3.75-
| 8 |
| 15 |
| 9 |
| 2 |
| 3 |
| 5 |
=[3.75-2.4]÷0.6,
=1.35÷0.6,
=2.25;
④
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 4 |
=
| 1 |
| 4 |
| 3 |
| 5 |
| 5 |
| 4 |
| 1 |
| 8 |
| 1 |
| 4 |
=
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 8 |
=
| 1 |
| 4 |
| 8 |
| 17 |
=
| 2 |
| 17 |
⑤(7
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
=7
| 1 |
| 3 |
=7
| 1 |
| 3 |
=7
| 1 |
| 3 |
⑥
9
| ||||||
9
|
=
(9+8-7)+(
| ||||||
(9-5+6)+(
|
=
10+(
| ||||||
10+(
|
=1;
⑦(
| 14 |
| 35 |
| 21 |
| 30 |
=(0.4×4.27+8.54×0.7)÷4.27×0.25,
=(1.708+5.978)×0.25÷4.27,
=7.686×0.25÷4.27,
=1.9215÷4.27,
=0.45;
⑧1
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
=(1+3+5+7+9)+(
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
=25+(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
=25+(
| 1 |
| 2 |
| 1 |
| 7 |
=25+
| 5 |
| 14 |
=25
| 5 |
| 14 |
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