就三道!(4x减3y)-[-(3y-x)+(x-y)]-5x等于?2(a(4x减3y)-[-(3y-x)+(x-y)]-5x等于?2(a-2a-3)-(2-a+3a)+3(1-a)等于?(2x加x-[4x-(3x-x)]其中,x等于负1又三分之二
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就三道!(4x减3y)-[-(3y-x)+(x-y)]-5x等于?2(a(4x减3y)-[-(3y-x)+(x-y)]-5x等于?2(a-2a-3)-(2-a+3a)+3(1-a)等于?(2x加x-[4x-(3x-x)]其中,x等于负1又三分之二
就三道!(4x减3y)-[-(3y-x)+(x-y)]-5x等于?2(a
(4x减3y)-[-(3y-x)+(x-y)]-5x等于?
2(a-2a-3)-(2-a+3a)+3(1-a)等于?
(2x加x-[4x-(3x-x)]其中,x等于负1又三分之二
就三道!(4x减3y)-[-(3y-x)+(x-y)]-5x等于?2(a(4x减3y)-[-(3y-x)+(x-y)]-5x等于?2(a-2a-3)-(2-a+3a)+3(1-a)等于?(2x加x-[4x-(3x-x)]其中,x等于负1又三分之二
1 A.B连直线 是去外婆家最近 B向河边做垂线 是去河边最近
2 1问 70/2+40/2=55
2问 mon=moc+noc=0.5aoc+0.5boc=0.5aob=0.5x
第一题原式=4x-3y-(-3y+x+x-y)-5x
=4x-3y+3y-x-x+y-5x
=y-3x
第二题原式=a²-2a-3-2+a²-3a²+3-3a
=-a²-5a-2
第三题原式=2x²+x-(4x²-3x²+x)
=x²
又∵x=-三分之五
∴原式=(-三分之五)²
=九分之二十五
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