3x^2y-[7x-4(x^2y+2x-3)]计算(要过程)计算:a-4分之1(1-3分之1a)-3分之1(2-4分之1a)
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3x^2y-[7x-4(x^2y+2x-3)]计算(要过程)计算:a-4分之1(1-3分之1a)-3分之1(2-4分之1a)
3x^2y-[7x-4(x^2y+2x-3)]计算(要过程)
计算:a-4分之1(1-3分之1a)-3分之1(2-4分之1a)
3x^2y-[7x-4(x^2y+2x-3)]计算(要过程)计算:a-4分之1(1-3分之1a)-3分之1(2-4分之1a)
①3x^2y-[7x-4(x^y+2x-3)]
=3x²y-7x+4x²y+8x-12
=7x²y+x-12;
②a-四分之一(1-三分之二a)-三分之一(2-四分之一a)
=a-1/4+a/6-2/3+a/12
=5a/4-11/12;
先化简,再求值
二分之一x-2(x-三分之一y^2)+(-三分之二x+三分之一y^2),其中x= -2 ,y=三分之二
=x/2-2x+2y²/3-2x/3+y²/3
=-13x/6+y²
=-13×(-2)/6+4/9
=13/3+4/9
=43/9;
=3x²y-(7x-4x²y-8x+12)
=(3x²y+4x²y)+x-12
=7x²y+x-12
a-1/4(1-1/3a)-1/3(2-1/4a)
=a-1/4+1/12a-2/3+1/12a
=(a+1/6a)+(-1/4-2/3)
=7/6a-11/12
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