
计算下列各式:(1)2+(-8)-(-3);(2)2-2÷13×3;(3)25×34?(?25)×12+25×(?14);(4)?22×|?
计算下列各式:(1)2+(-8)-(-3);(2)2-2÷13×3;(3)25×34?(?25)×12+25×(?14);(4)?22×|?12|+8÷(?2)2....
计算下列各式:(1)2+(-8)-(-3);(2)2-2÷13×3;(3)25×34?(?25)×12+25×(?14);(4)?22×|?12|+8÷(?2)2.
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(1)2+(-8)-(-3),
=2-8+3,
=5-8,
=-3;
(2)2-2÷
×3,
=2-2×3×3,
=2-18,
=-16;
(3)25×
-(-25)×
+25×(-
),
=25×
+25×
-25×
,
=25×(
+
-
),
=25×1,
=25;
(4)-22×|-
|+8÷(-2)2,
=-4×
+8÷4,
=-2+2,
=0.
=2-8+3,
=5-8,
=-3;
(2)2-2÷
1 |
3 |
=2-2×3×3,
=2-18,
=-16;
(3)25×
3 |
4 |
1 |
2 |
1 |
4 |
=25×
3 |
4 |
1 |
2 |
1 |
4 |
=25×(
3 |
4 |
1 |
2 |
1 |
4 |
=25×1,
=25;
(4)-22×|-
1 |
2 |
=-4×
1 |
2 |
=-2+2,
=0.
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