初一数学,要详细过程,谢谢,急要(分式的乘除)
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初一数学,要详细过程,谢谢,急要(分式的乘除)
1、下列计算正确吗?若不正确,请改正.
(1)1/a*a=1 (2)1/x-1/(x-1)=1
2、计算
(1)b/a²乘以a/b (2)ac²/3b三次乘以9b/a²c
(3)-2b/7xy²除以14ab/x²y (4)10mn除以-2n三次/5m
3、计算
(1)x²-y²/xy乘以x/x-y (2)a/a²+6a+9除以a²/a+3
1、下列计算正确吗?若不正确,请改正.
(1)1/a*a=1 (2)1/x-1/(x-1)=1
2、计算
(1)b/a²乘以a/b (2)ac²/3b三次乘以9b/a²c
(3)-2b/7xy²除以14ab/x²y (4)10mn除以-2n三次/5m
3、计算
(1)x²-y²/xy乘以x/x-y (2)a/a²+6a+9除以a²/a+3
![初一数学,要详细过程,谢谢,急要(分式的乘除)](/uploads/image/z/6405829-61-9.jpg?t=%E5%88%9D%E4%B8%80%E6%95%B0%E5%AD%A6%2C%E8%A6%81%E8%AF%A6%E7%BB%86%E8%BF%87%E7%A8%8B%2C%E8%B0%A2%E8%B0%A2%2C%E6%80%A5%E8%A6%81%EF%BC%88%E5%88%86%E5%BC%8F%E7%9A%84%E4%B9%98%E9%99%A4%EF%BC%89)
1、下列计算正确吗?若不正确,请改正.
(1)1/a*a=1 ——正确.
(2)1/x-1/(x-1)=1——错误.
2、计算
(1)b/a²乘以a/b
=1/a
(2)ac²/3b三次乘以9b/a²c
=c/3b^2
(3)-2b/7xy²除以14ab/x²y
=-2b/7XY*X^2Y/14ab
=-X/49a
(4)10mn除以-2n三次/5m
=10mn*(-5m/2n^3)
=-25m^2/n^2
3、计算
(1)x²-y²/xy乘以x/x-y
=(X+Y)(X-Y)/XY*X/(X-Y)
=(X+Y)/Y
(2)a/a²+6a+9除以a²/a+3
=a/(a+3)^2*(a+3)/a^2
=1/a(a+3).
(1)1/a*a=1 ——正确.
(2)1/x-1/(x-1)=1——错误.
2、计算
(1)b/a²乘以a/b
=1/a
(2)ac²/3b三次乘以9b/a²c
=c/3b^2
(3)-2b/7xy²除以14ab/x²y
=-2b/7XY*X^2Y/14ab
=-X/49a
(4)10mn除以-2n三次/5m
=10mn*(-5m/2n^3)
=-25m^2/n^2
3、计算
(1)x²-y²/xy乘以x/x-y
=(X+Y)(X-Y)/XY*X/(X-Y)
=(X+Y)/Y
(2)a/a²+6a+9除以a²/a+3
=a/(a+3)^2*(a+3)/a^2
=1/a(a+3).