解方程组 3(x+y)=30 ① 2/3x+2.7x+2.7y=30②
解方程组 3(x+y)=30 ① 2/3x+2.7x+2.7y=30②
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
5(x+y)+3(x-y)=90 5(x+y)-3(x-y)=30,解二元一次方程组
解二元一次方程组:{3x-y=-4①,x-2y=-3②
解二元一次方程组:①y=-2x+3 ② y=3x-7
解方程组(x/2-y/5=4①,x/7-y/15=3②)
解方程组x+y+z=30,3x+2y+z=50
解方程组:x/2+y/3=1 x*20%+y*30%=14*10%
解方程组{ 3x-4y(x-y)=3 { 2x-3y=1
如果方程组3x+y=k x+3y=2的解x,y
解方程组:{x+|3x-y|+3y=15 2x+y=6
解方程组x+y/3=x-y/4 2x+3y=11