The seventh grade, the second volume, Basic Mathematics Training P48 Shanghai Edition Answer
1 ~ 4: ACBA five. The square of x-8x-206. A=-4 b= 16 c=- 15 seven. -the 28th. 12 nine. The square of ab+B. X = 1 eleven. Four, twelve. -4x squared y squared+12xy-6 twelve. Reduced to 2X square -4xy-4y square, the answer is-1.
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