题目内容
计算
(1)
×[
-(
-
)]
(2)
×4.69+3.21×10
+7.9÷1
(3)
÷[(
-
)×3]×
(4)76×(
-
)+23×(
+
)-53×(
-
).
(1)
| 4 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
(2)
| 2 |
| 15 |
| 2 |
| 15 |
| 2 |
| 13 |
(3)
| 7 |
| 20 |
| 5 |
| 6 |
| 1 |
| 3 |
| 2 |
| 3 |
(4)76×(
| 1 |
| 23 |
| 1 |
| 53 |
| 1 |
| 53 |
| 1 |
| 76 |
| 1 |
| 23 |
| 1 |
| 76 |
(1)
×[
-(
-
)],
=
×[
-
+
],
=
×[
+
-
],
=
×[1-
],
=
×
,
=
;
(2)
×4.69+3.21×10
+7.9÷1
,
=
×4.69+3.21×(10+
)+7.9×
,
=
×4.69+32.1+3.21×
+7.9×
,
=32.1+
×(2×4.69+2×3.21+7.9×13),
=32.1+
×[(4.69+3.21)×2+7.9×13],
=32.1+
×[7.9×2+7.9×13],
=32.1+
×[(2+13)×7.9],
=32.1+
×15×7.9,
=32.1+7.9,
=40;
(3)
÷[(
-
)×3]×
=
÷[
×3]×
,
=
÷
×
,
=
×
×
,
=
;
(4)76×(
-
)+23×(
+
)-53×(
-
),
=76×
-76×
+23×
+23×
-53×
+53×
,
=(76-53)×
-(76-23)×
+(23+53)×
,
=23×
-53×
+76×
,
=1-1+1,
=1.
| 4 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 4 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 4 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
| 7 |
| 16 |
=
| 4 |
| 9 |
| 7 |
| 16 |
=
| 4 |
| 9 |
| 9 |
| 16 |
=
| 1 |
| 4 |
(2)
| 2 |
| 15 |
| 2 |
| 15 |
| 2 |
| 13 |
=
| 2 |
| 15 |
| 2 |
| 15 |
| 13 |
| 15 |
=
| 2 |
| 15 |
| 2 |
| 15 |
| 13 |
| 15 |
=32.1+
| 1 |
| 15 |
=32.1+
| 1 |
| 15 |
=32.1+
| 1 |
| 15 |
=32.1+
| 1 |
| 15 |
=32.1+
| 1 |
| 15 |
=32.1+7.9,
=40;
(3)
| 7 |
| 20 |
| 5 |
| 6 |
| 1 |
| 3 |
| 2 |
| 3 |
=
| 7 |
| 20 |
| 1 |
| 2 |
| 2 |
| 3 |
=
| 7 |
| 20 |
| 3 |
| 2 |
| 2 |
| 3 |
=
| 7 |
| 20 |
| 2 |
| 3 |
| 2 |
| 3 |
=
| 7 |
| 45 |
(4)76×(
| 1 |
| 23 |
| 1 |
| 53 |
| 1 |
| 53 |
| 1 |
| 76 |
| 1 |
| 23 |
| 1 |
| 76 |
=76×
| 1 |
| 23 |
| 1 |
| 53 |
| 1 |
| 53 |
| 1 |
| 76 |
| 1 |
| 23 |
| 1 |
| 76 |
=(76-53)×
| 1 |
| 23 |
| 1 |
| 53 |
| 1 |
| 76 |
=23×
| 1 |
| 23 |
| 1 |
| 53 |
| 1 |
| 76 |
=1-1+1,
=1.
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