已知-2a^2b^y+1与3a^2b^3是同类项,且2/3(x-5)^2+5|m|=0,求代数式(2x^2-3xy+6y
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已知-2a^2b^y+1与3a^2b^3是同类项,且2/3(x-5)^2+5|m|=0,求代数式(2x^2-3xy+6y^2)-m(3x^2-xy+9y^2)的值
坐等
坐等
-2a^2b^y+1与3a^2b^3是同类项
y=3
x-5=0 m=0
x=5
(2x^2-3xy+6y^2)-m(3x^2-xy+9y^2) m=0
=2x^2-3xy+6y^2 x=5,y=3
=2×5²-3×5×3+6×3²
=50-45+54
=59
再问: 已知-2a^2b^(y+1)与3a^2b^3是同类项,且2/3(x-5)^2+5|m|=0,求代数式(2x^2-3xy+6y^2)-m(3x^2-xy+9y^2)的值
再答: -2a^2b^(y+1)与3a^2b^3是同类项 y+1=3 y=2 2/3(x-5)^2+5|m|=0 x-5=0 m=0 x=5 (2x^2-3xy+6y^2)-m(3x^2-xy+9y^2) m=0 =2x^2-3xy+6y^2 x=5,y=2 =2×5²-3×5×2+6×2² =50-30+24 =44
y=3
x-5=0 m=0
x=5
(2x^2-3xy+6y^2)-m(3x^2-xy+9y^2) m=0
=2x^2-3xy+6y^2 x=5,y=3
=2×5²-3×5×3+6×3²
=50-45+54
=59
再问: 已知-2a^2b^(y+1)与3a^2b^3是同类项,且2/3(x-5)^2+5|m|=0,求代数式(2x^2-3xy+6y^2)-m(3x^2-xy+9y^2)的值
再答: -2a^2b^(y+1)与3a^2b^3是同类项 y+1=3 y=2 2/3(x-5)^2+5|m|=0 x-5=0 m=0 x=5 (2x^2-3xy+6y^2)-m(3x^2-xy+9y^2) m=0 =2x^2-3xy+6y^2 x=5,y=2 =2×5²-3×5×2+6×2² =50-30+24 =44
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