Ответ:
1/4x-3/7y=1/4*8-3/7*(-14) =1/2-(-6) =6,5
2/3x+4/5y=2/3*9+4/5*(-10) =6+(-8) =-2
a-3b/a+3b=4-3(-2)/4+3(-2) =10/-2=-5
a+3c/2a-c=3+3(-1)/2*3-(-1) =0/7=0
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Ответ:
1/4x-3/7y=1/4*8-3/7*(-14) =1/2-(-6) =6,5
2/3x+4/5y=2/3*9+4/5*(-10) =6+(-8) =-2
a-3b/a+3b=4-3(-2)/4+3(-2) =10/-2=-5
a+3c/2a-c=3+3(-1)/2*3-(-1) =0/7=0