(x―140)/70=4 (x一140)÷70=4

\uff08x-140\uff0970=4 \u89e3\u65b9\u7a0b

\u89e3\uff1a70X-9800=4
70X=9804
X=140+4/70

\uff08x-140\uff09\u00f770=4
x-140=4x70
x=280+140
x=420
\u9a8c\u8bc1\uff1a\u4e00\u822c\u89e3\u65b9\u7a0b\u4e4b\u540e\uff0c\u9700\u8981\u8fdb\u884c\u9a8c\u8bc1\u3002\u9a8c\u8bc1\u5c31\u662f\u5c06\u89e3\u5f97\u7684\u672a\u77e5\u6570\u7684\u503c\u4ee3\u5165\u539f\u65b9\u7a0b\uff0c\u770b\u770b\u65b9\u7a0b\u4e24\u8fb9\u662f\u5426\u76f8\u7b49\u3002\u5982\u679c\u76f8\u7b49\uff0c\u90a3\u4e48\u6240\u6c42\u5f97\u7684\u503c\u5c31\u662f\u65b9\u7a0b\u7684\u89e3\u3002
\u5de6\u8fb9=\uff08420-140\uff09\u00f770=280\u00f770=4
\u5de6\u8fb9=\u53f3\u8fb9
\u6269\u5c55\u8d44\u6599\uff1a
\u89e3\u65b9\u7a0b\u7684\u6b65\u9aa4\uff1a
\uff081\uff09\u6709\u62ec\u53f7\u5c31\u5148\u53bb\u6389\u3002
\uff082\uff09\u79fb\u9879\uff1a\u5c06\u542b\u672a\u77e5\u6570\u7684\u9879\u79fb\u5230\u5de6\u8fb9\uff0c\u5e38\u6570\u9879\u79fb\u5230\u53e6\u53f3\u8fb9\u3002
\uff083\uff09\u5408\u5e76\u540c\u7c7b\u9879\uff1a\u4f7f\u65b9\u7a0b\u53d8\u5f62\u4e3a\u5355\u9879\u5f0f\u3002
\uff084\uff09\u65b9\u7a0b\u4e24\u8fb9\u540c\u65f6\u9664\u4ee5\u672a\u77e5\u6570\u7684\u7cfb\u6570\u5f97\u672a\u77e5\u6570\u7684\u503c\u3002

(x―140)/70=4
解：x-140=4*70
x-140=280
x=280+140
x=420

X一140=4X70
X一140=280
X=280十140
X=420

420
很简单，去分母，去括号，移项，

(x鈥140)/70=4
绛旓細(x鈥140)/70=4 瑙ｏ細x-140=4*70 x-140=280 x=280+140 x=420

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