请大家帮忙来看下这道初二实数题哦，感谢所有答题的人哦，O(∩
\u8bf7\u5927\u5bb6\u5e2e\u5fd9\u6765\u770b\u4e0b\u8fd9\u9053\u521d\u4e8c\u5b9e\u6570\u9898\u54e6\uff0ca+a\u5206\u4e4b\u4e00=4\uff080\uff1ca\uff1c1\uff09\uff0c\u6c42a\u7684\u503c\uff0c\u611f\u8c22\u6240\u6709\u7b54\u9898\u7684\u4eba\u54e6\uff0cO(\u2229_\u2229)O\uff01a^2\ufe634a+1=0 a^2\ufe634a+4\ufe633=0
\uff08a\ufe632\uff09^2=3
a=2\u00b1\u6839\u53f73
\u56e0\u4e3a0\uff1ca\uff1c1 \u6240\u4ee5a=2\ufe63\u6839\u53f73
1.\u5df2\u77e5x\u7684\u7acb\u65b9\u6839=3\uff0c\u4e14\uff082y-3z+2)^2+\u6839\u53f7z-4=0
\u6c42x+y^3+z^3\u7684\u7acb\u65b9\u6839\u7684\u503c\u3002
x\u7684\u7acb\u65b9\u6839=3\uff0c\u6240\u4ee5x=27
\uff082y-3z+2)^2+\u6839\u53f7z-4=0\uff08\u611f\u89c9\u4e0d\u592a\u5bf9\uff0c\u5e94\u8be5\u662f\u201c\u6839\u53f7\uff08z-4\uff09\u201d\uff09
\uff082y-3z+2)^2\u548c\u6839\u53f7\uff08z-4\uff09\u90fd\u4e0d\u5c0f\u4e8e0\uff0c\u800c\u4e24\u8005\u548c\u4e3a0\uff0c\u6545\u90fd\u7b49\u4e8e0
\u5373\uff082y-3z+2)^2=\u6839\u53f7\uff08z-4\uff09=0\uff0c\u5f97z=4\uff0cy=5
x+y^3+z^3=27+5^3+4^3=27+125+64=216
x+y^3+z^3\u7684\u7acb\u65b9\u6839=6
2.\u5c06\u4e00\u5757\u4f53\u79ef\u4e3a0.125\u5e73\u65b9\u5398\u7c73\uff08\u7acb\u65b9\uff1f\uff09\u7684\u7acb\u65b9\u4f53\u94dd\u5757\u6539\u94f8\u62108\u4e2a\u540c\u6837\u5927\u5c0f\u7684\u7acb\u65b9\u4f53\u5c0f\u94dd\u5757\uff0c\u6c42\u6bcf\u4e2a\u5c0f\u7acb\u65b9\u4f53\u94dd\u5757\u7684\u8868\u9762\u79ef
\u8bbe\u5c0f\u7acb\u65b9\u4f53\u7684\u8fb9\u957f\u662fa\uff0c\u7531\u5c0f\u7acb\u65b9\u4f53\u4f53\u79ef\u548c\u7b49\u4e8e\u539f\u7acb\u65b9\u4f53\u4f53\u79ef\uff0c\u53ef\u5f97
8\u00d7a^3=0.125\u7acb\u65b9\u5398\u7c73\uff0c\u89e3\u5f97a=1/4 \u5398\u7c73\uff0c\u8868\u9762\u79efs=6\u00d7a^2=\u516b\u5206\u4e4b\u4e09\u5e73\u65b9\u5398\u7c73
3.\u6839\u53f732-\u6839\u53f78\u5206\u4e4b1+5\u5206\u4e4b1\u500d\u6839\u53f775-3\u500d\u6839\u53f73\u5206\u4e4b1+\u6839\u53f72\u5206\u4e4b4
=4 \u68392 - 1/4 \u68392 + 5\u5206\u4e4b5\u500d\u6839\u53f73 - \uff08\u540e\u9762\u8fd9\u4e9b\u5206\u5f0f\u5728\u6839\u53f7\u91cc\u9762\u8fd8\u662f\u53ea\u6709\u5206\u6bcd\u5728\u6839\u53f7\u91cc\u9762\uff1f\u9ed8\u8ba4\u4e3a\u201c-3\u500d\u6839\u53f7\uff083\u5206\u4e4b1\uff09+\uff08\u6839\u53f72\uff09\u5206\u4e4b4\u201d\uff09 \u68393 +2 \u68392
=\uff084 \u68392 - 1/4 \u68392 +2 \u68392\uff09 + \uff085\u5206\u4e4b5\u500d\u6839\u53f73 - \u68393\uff09
=23/4 \u68392 + 0 = 23/4 \u68392
4.-\uff08-2\uff09^-2+\u6839\u53f7\uff08\u6839\u53f73+2\uff09^2-(\u6839\u53f73+2\uff09^0+|3\u5206\u4e4b\u6839\u53f73-2\u5206\u4e4b\u6839\u53f73|\u9664\u4ee53\u5206\u4e4b2\u4e58\u4ee54
=-1/4 + \uff08\u6839\u53f73+2\uff09 - 1 + |-6\u5206\u4e4b\u68393|/2 \u00d73\u00d74
=-1/4 + \u6839\u53f73 + 2 - 1 + \u68393
=3/4 + 2\u68393
5.125x^3-y=20\uff0c\u6839\u53f7y=14.\u6c42x
\u6839\u53f7y=14\uff0c\u6240\u4ee5y=196\uff0c\u4ee3\u5165125x^3-y=20\uff0c\u5f97x^3=216/125\uff0cx\u7684\u503c\u4e3a5\u5206\u4e4b6.
\u5e73\u65f6\u591a\u505a\u9898\uff0c\u591a\u7ec3\u4e60\uff0c\u8fd9\u4e9b\u4e0d\u96be\u7684\u3002
把平方展开得a+（1除以a）-2=2
所以a+（1除以a）=4
所以（1+a的平方）除以a=a+（1除以a+2=6
补充回答(1):把平方展开得a-（1除以a）-2=2
补充回答(2)：
是减
（a-b）^2=a^2-2ab+b^2
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