解方程.(1)(9)/(10)x-2=(3)/(5) (2)x÷(2)/(5)=(3)/(8) (3)(2)/(5)+x=(18)/(25) (4)
解方程:(3)/(10)(200+x)-(2)/(10)(300-x)=300×(9)/(25).解方程:$\frac{3}{10}$(200+x)-$\fra
用列主元消去法解方程组 ) 3(x)_(1)-(x)_(2)+4(x)_(3)=1 -(x)_(1)+2(x)_(2)-9(x)_(3)=0 -4(x)_(1
2.解方程组 ) (x)_(1)+(x)_(2)+(x)_(3) (x)_(1)+(x)_(2)-(x)_(3)-(x)_(4)=1 5(x)_(1)+5(
解方程。x÷(2)/(3)=(9)/(10)x:0.3=(2)/(3)75%x-2.4=5.1解方程。x÷$\frac{2}{3}$=$\frac{9}{10}
解下列方程:(1)196x^2-1=0;(2)4x^2+12x+9=81;(3)x^2-7x-1=0;(4)2x^2+3x=3;(5)x^2-2x+1=25;(
解方程_(2)-3(x)_(3)+4(x)_(4)=-5-|||-x1- 2x3+324 =-4-|||-(x)_(1)+2(x)_(2)-5(x)_(4)=1
解方程组: ) (x)_(1)-(x)_(2)-(x)_(3)=2 2(x)_(1)-(x)_(2)-3(x)_(3)=1 3(x)_(1)+2(x)_(2)
解下列方程:(1)x2+10x+9=0;(2)x2-x-(7)/(4)=0;(3)3x2+6x-4=0;(4)4x2-6x-3=0;(5)x2+4x-9=2x-
若方程组 ) 7(x)_(1)+8(x)_(2)+9(x)_(3)=0 -(x)_(2)+2(x)_(3)=0 2(x)_(2)+t(x)_(3)=0 .=