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方程0.4x 3×0.5=7.5与方程x m÷0.1=20的解相同,求m...

0.4x+3*0.5=7.5 0.4x=7.5-3*1.5=6 x=15 将x=15代入x+m÷0.1=20得: 15+m÷0.1=20 m÷0.1=5 m=50

3x-3.2/0.4=1 3x-8=1 3x=9 x=3 x-m/0.1=1 3-m/0.1=1 m/0.1=2 m=0.2

5x+0.4=1.8 5x=1.4 x=0.28 mx-3=1.2 0.28m=4.2 m=15

m=0.2

x除以4=0.2 x=0.2x4 x=0.8 x-a=0.5 0.8-a=0.5 a=0.8-0.5 a=0.3

3x - 3.2/0.4 = 1 , 3x - 8 = 1 3x = 1 + 8 = 9 x = 3 x - m/0.1 = 1 , m /0.1 = x - 1 m = ( x - 1) 0.1 = ( 2 ) 0.1 m = 0.2

1/2x - 4 = m/3 → x/2 = m/3 + 4 x/2 - 6 + m = 0 → x/2 = -m+6 m/3 + 4 = - m + 6 m/3 + m = 6 - 4 4m/3 = 2 m = 3/2

2x+1/(1-x)=4 2X+1=4-4x X=1/2 把X=1/2代入 2X^2—KX+1=0 2×1/4—K/2+1=0 K=3 根据韦达定理:X1+X2=K/2=3/2 X2 = 3/2 - X1 = 3/2 - 1/2 =1 另一个解是1

(3x -3.2 )/0.4 = 1 (x-a)/0.1 = 1 得x = 0.1 +a 代入第一个式子 得a = 1.3

由3x+4=0可求出:x=-43,将x=-43代入方程3x+4k=8得:3×(-43)+4k=8,解得:k=3.

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