先把括號(hào)去了得出: X+2-2y-1=2X-4Y
移項(xiàng):2X-X=4Y-2Y+1
即:X=2Y+1
當(dāng)Y=0時(shí)代入 X=2Y+1即得出:X=1
當(dāng)Y=1時(shí)代入 X=2Y+1即得出:X=3
當(dāng)Y=-2時(shí)代入 X=2Y+1即得出:X=-3
(x+2)—(2y+1)=2x—4y用含y的式子表示x,并求當(dāng)Y=0,1,—2時(shí)x的值
(x+2)—(2y+1)=2x—4y用含y的式子表示x,并求當(dāng)Y=0,1,—2時(shí)x的值
數(shù)學(xué)人氣：747 ℃時(shí)間：2020-10-02 02:59:11
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