3×[(3x-2y)+(x-3y+1)]-2×[2×(3x-2y)-(x-3y+1)]等于几
2个回答
原式=3(3x-2y+x-3y+1)+2(6x-4y-x+3y-1)
=3(4x-5y+1)+2(5x-y-1)
=12x-15y+3+10x-2y-2
=22x-17y+1
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三道解方程⑴3y^2+2×根号(y^2+5y+1)=2-15y⑵(x^2-x)×根号〔(x+1)/(x-1)〕=0⑶3x