请教初中数学问题，求高手解答，要有详细步骤哦~
\u8bf7\u6559\u521d\u4e2d\u6570\u5b66\u95ee\u9898\uff0c\u6c42\u9ad8\u624b\u89e3\u7b54\uff0c\u8981\u6709\u8be6\u7ec6\u6b65\u9aa4\u54e6~\uff082\uff09\u5f0f\u53ef\u5316\u4e3a\uff1a
(x+y)(x-2y)=0
\u89e3\u5f97\uff1ax+y=0\u6216 x-2y=0
\u6240\u4ee5\u539f\u65b9\u7a0b\u7ec4\u7b49\u4ef7\u4e8e\uff1a
{ x-y=-2 { x-y=-2
{ x+y=0 \u6216\uff1a{ x-2y=0
\u6613\u89e3\u5f97\uff1a
{ x=-1 \u6216\uff1a { x=-4
{ y=1 { y=-2
\u521d\u4e2d\u6570\u5b66\u5408\u96c6\u767e\u5ea6\u7f51\u76d8\u4e0b\u8f7d
\u94fe\u63a5\uff1ahttps://pan.baidu.com/s/1znmI8mJTas01m1m03zCRfQ
?pwd=1234 \u63d0\u53d6\u7801\uff1a1234
\u7b80\u4ecb\uff1a\u521d\u4e2d\u6570\u5b66\u4f18\u8d28\u8d44\u6599\u4e0b\u8f7d\uff0c\u5305\u62ec\uff1a\u8bd5\u9898\u8bd5\u5377\u3001\u8bfe\u4ef6\u3001\u6559\u6750\u3001\u89c6\u9891\u3001\u5404\u5927\u540d\u5e08\u7f51\u6821\u5408\u96c6\u3002
明白了吗？
就是简单的除法问题吧= =
3*10^8除以350呗
结果的话就是可以把350变成3.5*10^2然后就变成3/3.5*10^8/10^2结果不是整数，用科学计数法的知识
300000000÷350≈857142倍
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