计算:(1)20-35+25-10(2)−64÷315×58(3)(512+23−34)×(−12)(4)−22×(−12)+8÷(−2)2
−64÷3×
(3)(+−)×(−12)
(4)−22×(−)+8÷(−2)21 |
1 | 5 |
5 | 5 |
5 | 8 |
8 | (+−)×(−12)
(4)−22×(−)+8÷(−2)25 |
5 | 12 |
12 | 2 |
2 | 3 |
3 | 3 |
3 | 4 |
4 | −22×(−)+8÷(−2)222×(−)+8÷(−2)222×(−)+8÷(−2)22×(−)+8÷(−2)21 |
1 | 2 |
2 | )2)22
答案和解析
(1)20-35+25-10
=20+25+[(-35)+(-10)]
=45+(-45)
=0;
(2)
−64÷3×
=-64××
=-;
(3)(+−)×(−12)
=×(-12)+×(-12)-×(-12)
=-5-8+9
=-4;
(4)−22×(−)+8÷(−2)2
=-4×(-)+8÷4
=2+2
=4. −64÷3
1 |
1 | 1
5 |
5 | 5×
5 |
5 | 5
8 |
8 | 8
=-64×
×
=-;
(3)(+−)×(−12)
=×(-12)+×(-12)-×(-12)
=-5-8+9
=-4;
(4)−22×(−)+8÷(−2)2
=-4×(-)+8÷4
=2+2
=4. 5 |
5 | 5
16 |
16 | 16×
=-;
(3)(+−)×(−12)
=×(-12)+×(-12)-×(-12)
=-5-8+9
=-4;
(4)−22×(−)+8÷(−2)2
=-4×(-)+8÷4
=2+2
=4. 5 |
5 | 5
8 |
8 | 8
=-
;
(3)(+−)×(−12)
=×(-12)+×(-12)-×(-12)
=-5-8+9
=-4;
(4)−22×(−)+8÷(−2)2
=-4×(-)+8÷4
=2+2
=4. 25 |
25 | 25
2 |
2 | 2;
(3)
(+−)×(−12)
=×(-12)+×(-12)-×(-12)
=-5-8+9
=-4;
(4)−22×(−)+8÷(−2)2
=-4×(-)+8÷4
=2+2
=4. (
5 |
5 | 5
12 |
12 | 12+
2 |
2 | 2
3 |
3 | 3−
3 |
3 | 3
4 |
4 | 4)×(−12)
=
×(-12)+×(-12)-×(-12)
=-5-8+9
=-4;
(4)−22×(−)+8÷(−2)2
=-4×(-)+8÷4
=2+2
=4. 5 |
5 | 5
12 |
12 | 12×(-12)+
×(-12)-×(-12)
=-5-8+9
=-4;
(4)−22×(−)+8÷(−2)2
=-4×(-)+8÷4
=2+2
=4. 2 |
2 | 2
3 |
3 | 3×(-12)-
×(-12)
=-5-8+9
=-4;
(4)−22×(−)+8÷(−2)2
=-4×(-)+8÷4
=2+2
=4. 3 |
3 | 3
4 |
4 | 4×(-12)
=-5-8+9
=-4;
(4)
−22×(−)+8÷(−2)2
=-4×(-)+8÷4
=2+2
=4. −2
2×(−)+8÷(−2)2
=-4×(-)+8÷4
=2+2
=4. 2×(−
1 |
1 | 1
2 |
2 | 2)+8÷(−2)
2
=-4×(-)+8÷4
=2+2
=4. 2
=-4×(-
)+8÷4
=2+2
=4. 1 |
1 | 1
2 |
2 | 2)+8÷4
=2+2
=4.
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