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7x+2=8(x%1)+4=9(x%2)+3

解: 7x+2=8(x-1)+4 7x+2=8x-8+4 8x-7x=2+8-4 x=6 9(x-2)+3 =9*(6-2)+3 =9x4+3 =36+3 =39

(3x十2)一(x十1)=(7x一4)一(4x+3) 2x+1=3x-7 x=8

x=(29.4-2*3)÷(7-1) =23.4÷6 =3.9

(1) 两边开方,得2(x - 1) = 3(x - 5)或2(x - 1) = -3(x - 5), 分别得x = 13和x = 17/5 (2) 只好套公式: x = (7 ± √41)/2 (3) (x - 2)(x + 1) = 0 x = 2, x = -1

(1)x4-7x2+1=x4+2x2+1-9x2=(x2+1)2-(3x)2=(x2+3x+1)(x2-3x+1);(2)x4+x2+2ax+1-a2=x4+2x2+1-x2+2ax-a2=(x2+1)2-(x-a)2=(x2+1+x-a)(x2+1-x+a);(3)(1+y)2-2x2(1-y2)+x4(1-y)2=(1+y)2-2x2(1-y)(1+y)+x4(1-y)2...

(1)2x+8=38, 2x+8-8=38-8, 2x÷2=30÷2, x=15;(2)8x-9=39, 8x-9+9=39+9, 8x÷8=48÷8, x=6;(3)58-7x=9, 58-7x+7x=9+7x, 58-9=9+7x-9, 49÷7=7x÷7, x=7;(4)0.6x+2.4=3.6,0.6x+2.4-2.4=3.6-2.4, 0.6x÷0.6=1.2÷0.6, x=2;(5)1...

(1) (3x+1)/4-1

你一个得0

(1)7x-6=8; 7X=8+6 7X=14 X=2 检验:把X=2代入方程得7*2-6=8,左右相等,X=2是原方程的解 (2)10x=4x-3; 4X-10X=3 -6X=3 X= -1\2 检验:把X=-1\2代入方程得10*(-1\2)= -5,4*(-1\2)-3= -5,左右相等,X= -1\2是原方程的解 (3)0.4x+...

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