(-1/3)²/(-1/3)³*(1/3)³/3的-2次方*(-3)的0次方

(-1/3)²/(-1/3)³*(1/3)³/3的-2次方*(-3)的0次方
(-1/3)²/(-1/3)³*(1/3)³/3的-2次方*(-3)的0次方

(-1/3)²/(-1/3)³*(1/3)³/3的-2次方*(-3)的0次方

=1/9÷(-1/27)×1/27÷1/9×1

=-3×1/27×9

=-1.

2、X^2的系数：(-3m+n+2)=0

X的系数：(-3n+2m)=0

解得：

m=6/7,n=4/7,.

3、∵∠AOF+∠BOF=180°,∠AOF=3∠BOF,

∴∠AOF=3/4×180°=135°,∠BOF=45°,

∵∠BOD=∠AOC=90°,

∴∠DOF=90°-∠BOF=45°.

(-1/3)²/(-1/3)³*(1/3)³/3^(-2)*(-3)º
= (1/3)²÷(-1/3)³*(1/3)³÷(1/3)²*1
=(1/3)²÷(1/3)² * (1/3)³÷(-1/3)³
=1x(-1)
=-1
第二...

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(-1/3)²/(-1/3)³*(1/3)³/3^(-2)*(-3)º
= (1/3)²÷(-1/3)³*(1/3)³÷(1/3)²*1
=(1/3)²÷(1/3)² * (1/3)³÷(-1/3)³
=1x(-1)
=-1
第二题：
根据题意有
x²项的系数为0得2-3m+n=0
x项的系数为0得2m-3n=0
联立解方程组得
m=6/7 n=4/7

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