解方程4x一3(20一x)=3
\u89e3\u65b9\u7a0b\u3002 4x-3(20-x)+4=0 \u600e\u4e48\u89e3\u8fd9\u9898\u65b9\u7a0b\uff1f
\u89e3\uff1a
\u5148\u53bb\u62ec\u53f7\uff0c\u5f974x-60+3x+4=0
\u79fb\u9879\uff0c\u5f97 4x+3x=60-4
\u5408\u5e76\u540c\u7c7b\u9879\uff0c\u5f97 7x=56
\u7cfb\u6570\u5316\u4e3a1\uff0c\u5f97 x=8
\u8fd9\u662f\u6559\u6750\u4e0e\u8001\u5e08\u683c\u5f0f\u90fd\u7b26\u5408\u7684\u6807\u7b54\uff01
\u795d\u4f60\u6210\u529f\uff01\u53ef\u4e0d\u91c7\u7eb3\uff01
\uff081\uff09\u89e3\uff1a\u53bb\u62ec\u53f7\u5f97\uff1a4x-60+3x=3\uff0c\u79fb\u9879\u5f97\uff1a4x+3x=3+60\uff0c\u5408\u5e76\u540c\u7c7b\u9879\u5f97\uff1a7x=63\uff0c\u4e24\u8fb9\u540c\u9664\u4ee57\u5f97\uff1ax=9\uff1b\uff082\uff09\u89e3\uff1a\u53bb\u5206\u6bcd\u5f97\uff1a2\uff082x+1\uff09-\uff085x-1\uff09=6\uff0c\u53bb\u62ec\u53f7\u5f97\uff1a4x+2-5x+1=6\uff0c\u79fb\u9879\u5f97\uff1a4x-5x=6-1-2\uff0c\u5408\u5e76\u540c\u7c7b\u9879\u5f97\uff1a-x=3\uff0c\u4e24\u8fb9\u540c\u9664\u4ee5-1\u5f97\uff1ax=-3\uff0e
解：4x-60+3x=34x+3x=3+60
7x=63
x=9
不知道你会不会移项
4x一3(20一x)=3
4x-60+3x=3
7x=63
x=9
x=9，去括号合并
绛旓細锛1锛鍘绘嫭鍙峰緱锛4x-3=60-3x锛岀Щ椤瑰悎骞跺悓绫婚」寰楋細7x=63锛岀郴鏁板寲涓1寰楋細x=9锛涳紙2锛夌Щ椤瑰緱锛56x-0.2x=0.7锛屽悎骞跺悓绫婚」寰楋細1930x=2130锛岀郴鏁板寲涓1寰楋細x=2119锛锛3锛绉婚」寰楋細x-12x-13x=2锛屽悎骞跺悓绫婚」寰楋細16x=2锛岀郴鏁板寲涓1寰楋細x=12锛
绛旓細4x涓3(20涓x)=6x涓7(9涓x)4x-60+3x=6x-63+7x 7x-6x-7x=-63+60 -6x=-3 x=0.5
绛旓細鈶4x-3(20-x)=6x-7(9-x)4x-60+3x=6x-63+7x锛堢Щ椤癸級6x=3 x=1/2 鈶2锛坸-2)-3(4x-1)=9(1-x)2x-4-12x+3=9-9x -x=10 x=-10 鈶2x=3锛2x-1)=16-锛坸+1锛夛紵鈶2锛10-0.5y锛=锛1.5y+2)20-y=1.5y+2 2.5y=18 y=7.2 鈶+5/4-锛坸-5)=x+3/3-x-2/2 ...
绛旓細浜诧紒鎮ㄥソ锛佽繖閲屾槸鍗楅湼澶╀箰涔愪负浣犺В绛旓細瑙ｏ細4x-3(20-x)=-4 4x-60+3x=-47x=-4+607x=-56x=-8 瑙ｏ細3鍒嗕箣1锛1-2x锛=7鍒嗕箣2锛3x+1锛1/3(1-2*x)=2/7(3x+1) 1/3-2/3*x=6/7*x+2/71/3-2/7=6/7*x+2/3*x(7-6)/21=(18+14)/21*x1/21=32x/21x=1/32 濡...
绛旓細4x-3(20-x)=60-5(9-x)4x-60+3x=60-45+5x 7x-60=15+5x 7x-5x=15+60 2x=75 x=37.5
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绛旓細锛1锛鍘绘嫭鍙峰緱锛4x-60+3x=-4锛屾暣鐞嗗緱锛7x=56锛岃В寰楋細x=8锛涳紙2锛夊幓鍒嗘瘝寰楋細3锛3x-1锛-12=2锛5x-7锛夛紝鍘绘嫭鍙峰緱锛9x-3-12=10x-14锛岀Щ椤瑰緱锛9x-10x=-14+3+12锛屽悎骞跺悓绫婚」寰楋細-x=1锛鏂圭▼涓よ竟闄や互-1寰楋細x=-1锛
绛旓細4x-3(20-x)=6x-7(9-x)4x-60+3x=6x-63+7x 7x-60=13x-63 13x-7x=63-60 6x=3 x=0.5
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