2,5,20,12,-8,(),10A,7 B,8 C,12 D,-8答案选A,
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2,5,20,12,-8,(),10A,7B,8C,12D,-8答案选A,2,5,20,12,-8,(),10A,7B,8C,12D,-8答案选A,2,5,20,12,-8,(),10A,7B,8C,
2,5,20,12,-8,(),10A,7 B,8 C,12 D,-8答案选A,
2,5,20,12,-8,(),10
A,7 B,8 C,12 D,-8答案选A,
2,5,20,12,-8,(),10A,7 B,8 C,12 D,-8答案选A,
2+10=1220+(-8)=125+7=12以12为中心,相对称的两个数相加等于12"
合并同类项:a-2a-3a+4a+5a-6a-7a+8a+9a-10a-11a+12a+……+2008a+2009a-2010a-2011a
a-2a+3a-4a+5a-6a+7a-8a+9a-10a+11a.+99a-100a=
a-2a-3a+4a+5a-6a-7a+8a+9a-10a-11a.+2008a+2009a-2010a-2011a如何合并同类项?
(3a+5)-{9a-[6a+2-(12a-10)+2(a+1)]}
(3a+5)-{9a-[6a+2-(12a-10)+2(a+1)]
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-5a^3+10a^2-20a=?
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逻辑运算中A表示什么 (1) 0 · A = 0 (10) 1' = 0; 0' = 1 (2) 1 · A = A (11) 1 + A = 1 (3) A · A = A (12) 0 + A = A (4) A · A' = 0 (13) A + A = A (5) A · B = B · A (14) A + A' = 1 (6) A·(B·C) = (A·B)·C (15) A
(10a^8-6a^5+2a)÷(-2a)
(10a的8次方-6a的5次方+2a)÷(-2a)
a^2-12a+20
12a-5a=8a=6a
快 2a-10/9-6a+a²÷(a²-25)*3a²+15a/5-a化简 2a-10/9-6a+a²÷(a²-25)*3a²+15a/5-a 20分钟内做出我给100悬赏分啊,化简 (2a-10)/(9-6a+a²) ÷ (a²-25) * (3a²+15a)/(5-a ) / 为分数线