有理数的及其运算 答案正确的.)
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有理数的及其运算 答案正确的.)
1,7+(-2)-3.4
2,-21.6+3-7.4+(负五分之2)
3,31+(负四分之五)+0.25
4,7-(负二分之一)+1.5
5,49-(-20.6)负五分之三
6,(负五分之六)-7 -(-3.2)+(-1)
1,7+(-2)-3.4
2,-21.6+3-7.4+(负五分之2)
3,31+(负四分之五)+0.25
4,7-(负二分之一)+1.5
5,49-(-20.6)负五分之三
6,(负五分之六)-7 -(-3.2)+(-1)
![有理数的及其运算 答案正确的.)](/uploads/image/z/18428274-18-4.jpg?t=%E6%9C%89%E7%90%86%E6%95%B0%E7%9A%84%E5%8F%8A%E5%85%B6%E8%BF%90%E7%AE%97+%E7%AD%94%E6%A1%88%E6%AD%A3%E7%A1%AE%E7%9A%84.%EF%BC%89)
1.7+(-2)-3.4
=7-2-3.4
=5-3.4
=1.6
2.-21.6+3-7.4+(-2/5)
=(-21.6-7.4)+3-2/5
=-29+3-2/5
=-26又五分之二
3.31+(-5/4)+0.25
=31-1.25+0.25
=31-1
=30
4.7-(-1/2)+1.5
=7+0.5+1.5
=7+2
=9
5.49-(-20.6)-3/5
=49+20.6-0.6
=49+20
=69
6.(-6/5)-7 -(-3.2)+(-1)
=-1.2-7+3.2-1
=(-1.2+3.2)-8
=2-8
=-6
=7-2-3.4
=5-3.4
=1.6
2.-21.6+3-7.4+(-2/5)
=(-21.6-7.4)+3-2/5
=-29+3-2/5
=-26又五分之二
3.31+(-5/4)+0.25
=31-1.25+0.25
=31-1
=30
4.7-(-1/2)+1.5
=7+0.5+1.5
=7+2
=9
5.49-(-20.6)-3/5
=49+20.6-0.6
=49+20
=69
6.(-6/5)-7 -(-3.2)+(-1)
=-1.2-7+3.2-1
=(-1.2+3.2)-8
=2-8
=-6