3既是(x-1)的算术平方根,又是(x-2y+1)的立方根,
x-1=32=9,x-2y+1=33,
x=8,y=-9,
x2-y2
=(x+y)(x-y)
=(8-9)×(8+9)
=-17.
已知3既是(x-1)的算术平方根,又是(x-2y+1)的立方根,求x2-y2的平方根.
已知3既是(x-1)的算术平方根,又是(x-2y+1)的立方根,求x2-y2的平方根.
数学人气:511 ℃时间:2019-10-23 17:04:14
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