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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 9: Giải hệ phương trình 2(x-2y)+3(x+2y)=4 (x-y)+2(x+y)=1

Toán Lớp 9: Giải hệ phương trình
2(x-2y)+3(x+2y)=4
(x-y)+2(x+y)=1

Comments ( 2 )

  1. $\left \{ {{2(x-2y)+3(x+2y)=4} \atop {(x-y)+2(x+y)=1}} \right.$ 
    ⇔$\left \{ {{2x-4y+3x+6y=4} \atop {x-y+2x+2y=1}} \right.$ 
    ⇔$\left \{ {{5x+2y=4} \atop {3x+y=1}} \right.$ 
    ⇔$\left \{ {{5x+2y=4} \atop {6x+2y=2}} \right.$ 
    ⇔$\left \{ {{-x=2} \atop {6x+2y=2}} \right.$ 
    ⇔$\left \{ {{x=-2} \atop {6.-2+2y=2}} \right.$ 
    ⇔$\left \{ {{x=-2} \atop {y=7}} \right.$ 
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222-9+11+12:2*14+14 = ? ( )

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