1.化简:(5X-3Y-2XY)-(6X+5Y-2XY); 2.先化简,再求值:12(-4分之3A+2)-15(5分之1-9分之4A)其中A=-7分之3
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1.化简:(5X-3Y-2XY)-(6X+5Y-2XY);2.先化简,再求值:12(-4分之3A+2)-15(5分之1-9分之4A)其中A=-7分之31.化简:(5X-3Y-2XY)-(6X+5Y-2
1.化简:(5X-3Y-2XY)-(6X+5Y-2XY); 2.先化简,再求值:12(-4分之3A+2)-15(5分之1-9分之4A)其中A=-7分之3
1.化简:(5X-3Y-2XY)-(6X+5Y-2XY); 2.先化简,再求值:12(-4分之3A+2)-15(5分之1-9分之4A)
其中A=-7分之3
1.化简:(5X-3Y-2XY)-(6X+5Y-2XY); 2.先化简,再求值:12(-4分之3A+2)-15(5分之1-9分之4A)其中A=-7分之3
(5X-3Y-2XY)-(6X+5Y-2XY)
=5X-3Y-2XY-6X-5Y+2XY
=-X-8Y
12(-4分之3A+2)-15(5分之1-9分之4A)
=-9A+24-3+3分之20A
=3分之7A+21
=-7/3*3/7+21
=20
原式=5X-3Y-2XY-6X-5Y+2XY
=-X-8Y
原式=-9A+24-3+3分之20A
=21-3分之7A
=21+1
=22
(5X-3Y-2XY)-(6X+5Y-2XY)=5X-6X-3Y-5Y-2XY+2XY=-X-8Y 12(-4分之3A+2)-15(5分之1-9分之4A)=12X(-3A/4+2)-15X(1/5-4A/9)=-9A+24-3+20A/3 =-7A/3+21 带入A=-7分之3得1+21=22
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