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计算(x+3)•(x﹣3)正确的是(  )

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x6÷x3=x2B  (x-1)2=x2-1  x4+x4=x8  (x-1)2=x2-2x+1  
G(S)=G1(S)X1(S)+G2(S)X2(S)+G3(S)X3(S)  G(S)=G1(S)X1(S)G2(S)X2(S)G3(S)X3(S)  G(S)=G1(S)+G2(S)+G3(S)  G(S)=G1(S)G2(S)G3(S)X3(S)  
28x3%=0.84万元  30x3%=0.9万元  (30+28 ) x3%=1.74万元  ( 20+12 ) x3%=0.96万元  
总造价x3%  税前造价x3%  息税前造价x3%  (销项税-进项税)税额乘以3%  
20600÷(1+3%)x3%+123600x2%  20600÷(1+3%)x3%+123600÷(1+2%)x2%  20600x3%+123600x2%  20600÷(1+3%)x3%+123600÷(1+3%)x2%  
(100+60)x3%=4.8(万元)  (100+70+60)x3%=6.9(万元)  100x3%=3(万元)  (100+70)x3%=5.1(万元)  
(直接费+间接费+利润)x3%  直接费x3%  (直接费+间接费)x3%  营业额x3%  
x2·x3=x6   (x2)3=x8   x2+x3=x5   x6÷x3=x3  
(100+60)x3%=4.8(万元)  (100+70+60)x3%=6.9(万元)  100x3%=3(万元)  (100+70)x3%=5.1(万元)  

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