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The seventh grade mathematics experimental class optimized training answer.
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P98 6.3(2): 12:5

My solution: the original formula =a? -4a+4+b? -6b+9=(a-2)? +(b-3)? =0 ∴a=2,b=3 ∴a+b=2+3=5

P99 6.4、2:C,

5. Answer (④ Yes)

9.a=25,b=9/25 (5x+3y)(5x-3y)=25x? -9y? ∴ax? Abby? =25x? -9y? a=25 ab=9 b=9/25

12: 328 original formula = I (r1+R2+R3) = 3.28 (39.2+22.5+38.3) = 3.28×100 = 328.