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①2(6%0.5y)=3(2y%1)②1/5(x+15)=1/2%1/3(x%7)③2/3x...

①2(6-0.5y)=3(2y-1) 去括号,得 12-y=6y-3 移项,得 -y-6y=-3-12 合并同类项,得 -7y=-15 系数化为1,得 y=15/7 ②1/5(x+15)=1/2-1/3(x-7) 去分母,得 6(x+15)=15-10(x-7) 去括号,得 6x+90=15-10x+70 移项,得 6x+10x=15+70-90 合并同类项,得 ...

x-1/2(x-1)=4/3(x-1) 6x-3(x-1)=8(x-1) 6x-3x-8x=-8-3 -5x==11 x=11/5 4(2y-1)=3(y+2)-12 8y-3y=6-12+4 5y=-2 y=-2/5

方程1两边同时乘以20得8(x-0.5)-15(y+2)=20,即8x-15y=54 .....3方程2得6x+15y=-22 ......43式+4式得14x=32 得x=16/7带入3式得y=-50/21望采纳,谢谢

x=1

x/0.4-(2x-1)/0.2=-0.5 方程两边同乘以0.4得:x-2(2x-1)=-0.2 去括号得: x-4x+2=-0.2 移向得: x-4x=-2-0.2 合并同类项得: -3x=-2.2 x=22/3

8x-2(1-x)=9x-3(x+2) 8x-21+2x=9x-3x-6 8x+2x-9x+3x=-6+21 4x=15 x=15/4 3/2[2/3*(4/3x-1/3)]=4/5x 4/3x-1/3=4/5x 20x-5=12x 8x=5 x=5/8 3(2y+1)/4+1=4(2y+1)/3 4(2y+1)+12=3(2y+1) 8y+4+12=6y+3 8y-6y=3-4-12 2y=-13 y=-13/2 1/5[(1/2y-1)-6]=1...

大概步骤

#include #include int main(){ double y=0,n,m,x; int i=2,t; scanf("%lf",&x); while(i

scanf("%d%lf",&x);还有一个呢?

这道题要求计算能力很强 3/x+1/(x-1)+4/(x-2)+4/(x-3)+1/(x-4)+3/(x-5)=0 [3/x+3/(x-5)]+[1/(x-1)+1/(x-4)]+[4/(x-2)+4/(x-3)]=0 (6x-15)/(x^2-5x)+(2x-5)/(x^2-5x+4)+(8x-20)/(x^2-5x+6)=0 (2x-5)[3/(x^2-5x)+1/(x^2-5x+4)+4/(x^2-5x+6)]=0 所...

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