1)1,2m-3n=0,2m+1,5n=-13
1,2m-3n=0
4 m+3n=-26
5,2m=-26, m=-5
n=1/3(1,2.(-5))=1/3.(-6)=-2
/m,n/=/-5,-2/
2)1/2a +1/3b=1/3, 1/4a-1/2b=3/4
3a+2b=1
a -2b=3
4a=4,a=1, b=1/2(1-3)=-1
/a,b/=/1,-1/
3)0,1x+0,2y=0,3, 0,6x-0,5y=0,1
x+2y=3, 6x-5y=1
x=3-2y, 6(3-2y)-5y=1,18-12y-5y=1,-17y=-17, y=1
x=3-2.1=1
/x,y/=/1,1/
4)2/3p-3/5q=-1 /.15
5/6p+7/10q=6 /.30
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10p-9q=-15 /.5
25p+21q=180 / .(-2)
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50p-45q=-75
-50p-42q=-360
-87q=-435, q=5
p=(-15+45)/10=30/10=3
/p,q/=/3,5/