一道四年级的数学题,哪位能帮我解一下?
\u89e3\u4e00\u9053\u5c0f\u5b66\u56db\u5e74\u7ea7\u6570\u5b66\u9898\u8be5\u9898\u8981\u9006\u5411\u63a8\u5bfc\uff0c
1\u3001\u5148\u7b97\u51fa\u6269\u5927100\u500d\u540e\u7684\u6570\u662f\uff1a3.07\u4e58\u4ee510\u7b49\u4e8e30.7
2\u3001\u6c42\u5f97\u539f\u6570\u4e3a\uff1a30.7\u9664\u4ee5100\u7b49\u4e8e0.307
\u8fd9\u4e2a\u6570\u662f0.307
\u8bbe\u5bbf\u820d\u6709x\u95f4\uff0c\u5b66\u751f\u6709y\u4eba\u3002
5x+14=y
7x-4=y
\uff08\u5c0f\u5b66\u56db\u5e74\u7ea7\u5b66\u4e60x,y\u4e86\u5427\uff09
x=9 y=59
(7-5)*15=30,和=(7+5)*15=180
525/15=35,35=5*7,
(7-5)*15=30,和=(7+5)*15=180
180
180
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