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1.解方程. (1) 100+x=250 (2) x+12=3

(1)移项得,x-5x=37-13,合并同类项得,-4x=24,系数化为1得,x=-6;(2)去括号得,3x-6-2=x-2x+2,移项得,3x-x+2x=2+6,合并同类项得,4x=8,系数化为1得,x=2;(2)去分母得,2(x+1)-8=x,去括号得,2x+2-8=x,移项得,2x-x=-2+8,合并...

2(x-y)/3-(x+y)/4=-1/12, 8(x-y)-3(x+y)=-1; 5x-11y=-1(1) 3(x+y)-2(2x-y)=3 3x+3y-4x+2y=3; 5y-x=3; 25y-5x=15; 14y=14; y=1; x=2; 请采纳 如果你认可我的回答,敬请及时采纳, ~如果你认可我的回答,请及时点击【采纳为满意回答】按钮 ~~手机...

(1)原式= 12 ÷ 3 - 48 ÷ 3 =2-4=-2;(2)∵x(x-2)+x-2=0∴(x+1)(x-2)=0∴x+1=0或x-2=0解得x 1 =-1,x 2 =2.

错在第一步.正确的解答应该为:(1)去括号,得x-2-3x+1=1-x;(2)移项,得-2x+x=1+1;(3)合并同类项,得-x=2;(4)最后得x=-2.

100(1+x)²=144 解:两边同时除以100得: (1+x)²=144/100 两边同时开平方得: 1+x=±12/10 x=0.2 或者 x=-2.2

1/[x(x+1)]+1/(x+1)(x+2)+1/(x+2)(x+3)+....+1/(x+9)(x+10)=5/12 1/x-1/(x+1)+1/(x+1)-1/(x+2)+...+1/(x+9)-1/(x+10)=5/12; 1/x-1/(x+10)=5/12; 12(x+10)-12x=5x(x+10); 120=5x²+50x; x²+10x-24=0; (x+12)(x-2)=0; x=2或x=-12; 您好...

(x-1)÷0.3-(x+2)÷0.5=12这个方程怎样解 解:5(x-1)-3(x+2)=18 5x-5-3x-6=18 5x-3x=18+6+5 2x=29 x=14.5

同学你好: 解:①式等式两边同时乘以12可得:8x-8y-12x+3y=-1 化简为:4x+5y=1……③ ②式可化为:-x+5y=3……④ ③-④可得:5x=-2 所以x=-2/5 代入④可得:2/5+5y=3 所以y=17/25 回答完毕 ,感谢你的提问,满意请给好评呦,祝你学习进步!

(4x-12):(x+12)=3:2 2(4x-12)=3(x+12) 8x-24=3x+36 8x-3x=36+24 5x=60 x=60÷5 x=12

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