2,3,1,2,6,7,() A.9 B.5 C.11 D.24
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2,3,1,2,6,7,()A.9B.5C.11D.242,3,1,2,6,7,()A.9B.5C.11D.242,3,1,2,6,7,()A.9B.5C.11D.24隔项相加可得出:2+1=3,3+
2,3,1,2,6,7,() A.9 B.5 C.11 D.24
2,3,1,2,6,7,() A.9 B.5 C.11 D.24
2,3,1,2,6,7,() A.9 B.5 C.11 D.24
隔项相加可得出:2+1=3,3+2=5,1+6=7,2+7=9,所得的和组成等差数列.故空缺项为11-6=5,选B"
先化简,再求值:(2a-b)^2-(2a+b)(a-b)-3(a-3b)(a+3b),其中|a-1|+b^2=6b-9
(a^2+1)(-4a^2+1)+a^4-1 3a(a-b)(a+b)-6(b-a)^2a^2-9(a-b)^2= 3a(a-b)(a+b)-6(b-a)^2=
因式分解:(a+1)(a+3)(a+5)(a+7)+15 a(a-b+2)-6b(b+1)(a+1)(a+3)(a+5)(a+7)+15a(a-b+2)-6b(b+1)
5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b)
1/4(a-b)^2+3(a-b)(a+b)+9(a+b)^2
2a-{7b+[4a-7b-(2a-6a-4b)]-3a
A=B+B+B+B+B+B+B+B+B+B+B+B+B+B+B A-B×3=C C+2×7+2=1A=B+B+B+B+B+B+B+B+B+B+B+B+B+B+BA-B×3=CC+2×7+2=148148-(C-32)=DA,B,C,D各是多少?
3(a-b)的平方-7(a-b)+8(a-b)的平方+6(a-b) a-b=2
计算:(-2a^2b)^2-(3a^3b^2)÷5a^2b^2+7a^9b^6÷2a^5b^4
5a+{3b+[6c-2a-2(a-c)]}-[9a-(7b+c)]
等式:(a+b)^0=1 (a+b)^1=a+b (a+b)^2(a+b)^0=1(a+b)^1=a+b(a+b)^2=a^2+2ab+b^2(a+b)^3=a^3+3a^2b+3ab^2+b^3问:(a+b)^4=?(a+b)^5=?``````` (a+b)^9=?
5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)]
5a-{-3b+[6c-2a-(a-c)}-[9a-(7b+c)]
5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)]
计算:5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)]
1/a-b-1/a+b-2b/a^2+b^2-4b^3/a^4+b^4+8b^7/b^2-a^2
初二分式的加减法2a-b-c/(a-b)(a-c)+ 2b-c-a/(b-c)(b-a)+ 2c-b-a/(c-b)(c-a)3a-6b/a+b- 5a-6b/a-b- 4a-5b/a+b+ 7a-8b/b-a注:有空格的地方是下一个分式
1/(a-b)-1/(a+b)-(2b)/(a^2+b^2)-(4b^3)/(a^4+b^4)+(8b^7)/(b^8-a^8)快