By 蚂虾 说, 2月 19, 2010
1.戢阋=66+65-2*65*(65+1)=66+65-2*65-2*65=-1302.戢阋=1025-(1025+1)*(1025-1)=1025-1025+1=13.戢阋=4*(2钴蟓郯)-2*(2钴蟓郯)-2钴蟓郯=2钴蟓郯4.2x+5x+3=(2x+3)*(x+1)5.2x-7x+3=(2x-1)*(x-3)6.16x-31xy-2y=(16x+y)*(x-2y)7.a-4ab+3b=(a-3b)*(a-b)8.1/8m-3/4m+1=(1/4m-1)*(1/2m-1) 感谢啦
By 理塘 说, 2月 19, 2010
1.65^2+66^2-130*66=65^2+66^2-2*65*66 =(66-65)^2 =12.1025^2-1024*1026=1025^2- (1025+1)(1025-1) =1025^2-(1025^2-1) =13.2^10-2^9-2^8=2^8(2^2-2-1) =2^8*1 =2564.=(x+1)(2x+3)5.=(x-3)(2x-1)6.=(x-2y)(16x+y)7.(a-3b)(a-b)8=(1/8)*(m^2-6m+8) =(1/8)*(m-2)*(m-4)
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By 蚂虾 说, 2月 19, 2010
1.戢阋=66+65-2*65*(65+1)=66+65-2*65-2*65=-1302.戢阋=1025-(1025+1)*(1025-1)=1025-1025+1=13.戢阋=4*(2钴蟓郯)-2*(2钴蟓郯)-2钴蟓郯=2钴蟓郯4.2x+5x+3=(2x+3)*(x+1)5.2x-7x+3=(2x-1)*(x-3)6.16x-31xy-2y=(16x+y)*(x-2y)7.a-4ab+3b=(a-3b)*(a-b)8.1/8m-3/4m+1=(1/4m-1)*(1/2m-1) 感谢啦
By 理塘 说, 2月 19, 2010
1.65^2+66^2-130*66=65^2+66^2-2*65*66 =(66-65)^2 =12.1025^2-1024*1026=1025^2- (1025+1)(1025-1) =1025^2-(1025^2-1) =13.2^10-2^9-2^8=2^8(2^2-2-1) =2^8*1 =2564.=(x+1)(2x+3)5.=(x-3)(2x-1)6.=(x-2y)(16x+y)7.(a-3b)(a-b)8=(1/8)*(m^2-6m+8) =(1/8)*(m-2)*(m-4)