初二数学题在线解答(超急)(因式分解) 25t⒉=25t的平方(1) 1+10t+25t⒉ (2)M⒉—14M+49 (3) y⒉+y+四分之一 (4)(m+n)⒉—4m(m+n)+4m⒉ (5)25a⒉—80a+64 (6)
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![初二数学题在线解答(超急)(因式分解) 25t⒉=25t的平方(1) 1+10t+25t⒉ (2)M⒉—14M+49 (3) y⒉+y+四分之一 (4)(m+n)⒉—4m(m+n)+4m⒉ (5)25a⒉—80a+64 (6)](/uploads/image/z/5603572-28-2.jpg?t=%E5%88%9D%E4%BA%8C%E6%95%B0%E5%AD%A6%E9%A2%98%E5%9C%A8%E7%BA%BF%E8%A7%A3%E7%AD%94%EF%BC%88%E8%B6%85%E6%80%A5%EF%BC%89%EF%BC%88%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%89+25t%E2%92%89%3D25t%E7%9A%84%E5%B9%B3%E6%96%B9%EF%BC%881%EF%BC%89++1%2B10t%2B25t%E2%92%89+++++++++++++++%EF%BC%882%EF%BC%89M%E2%92%89%E2%80%9414M%2B49+%EF%BC%883%EF%BC%89+y%E2%92%89%2By%2B%E5%9B%9B%E5%88%86%E4%B9%8B%E4%B8%80++++++++++%EF%BC%884%EF%BC%89%EF%BC%88m%2Bn%29%E2%92%89%E2%80%944m%EF%BC%88m%2Bn%EF%BC%89%2B4m%E2%92%89+%EF%BC%885%EF%BC%8925a%E2%92%89%E2%80%9480a%2B64++++++++++++%EF%BC%886%EF%BC%89)
初二数学题在线解答(超急)(因式分解) 25t⒉=25t的平方(1) 1+10t+25t⒉ (2)M⒉—14M+49 (3) y⒉+y+四分之一 (4)(m+n)⒉—4m(m+n)+4m⒉ (5)25a⒉—80a+64 (6)
初二数学题在线解答(超急)
(因式分解) 25t⒉=25t的平方(1) 1+10t+25t⒉ (2)M⒉—14M+49 (3) y⒉+y+四分之一 (4)(m+n)⒉—4m(m+n)+4m⒉ (5)25a⒉—80a+64 (6)a⒉+2a(b+a)+(b+c)⒉ 各位大哥大姐帮我帮这六题解答下,谢谢了.摆脱,非常的急!
初二数学题在线解答(超急)(因式分解) 25t⒉=25t的平方(1) 1+10t+25t⒉ (2)M⒉—14M+49 (3) y⒉+y+四分之一 (4)(m+n)⒉—4m(m+n)+4m⒉ (5)25a⒉—80a+64 (6)
答案见附图
(1)1+10t+25t²=(1+5t)²
(2)M⒉—14M+49 =(M-7)²
(3) y⒉+y+1/4=(y+1/2)²
(4)(m+n)⒉—4m(m+n)+4m⒉ =m²-2mn+n²=(m-n)²
(5)25a⒉—80a+64=(5a-8)²
(6)a⒉+2a(b+c)+(b+c)⒉ =(a+b+c)²
(1) 1+10t+25t⒉
=5t*5t+2*5t*1+1*1=(5t+1)^2
(2)M⒉—14M+49
=m*m-2*7*m+7*7=(m-7)^2
(3)y⒉+y+四分之一
=y*y+2*(1/2)*y+(1/2)*(1/2)
=(y+1/2)^2
(4)(m+n)⒉—4m(m+n)+4m⒉
=(m+n)*(m+n)-2*2...
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(1) 1+10t+25t⒉
=5t*5t+2*5t*1+1*1=(5t+1)^2
(2)M⒉—14M+49
=m*m-2*7*m+7*7=(m-7)^2
(3)y⒉+y+四分之一
=y*y+2*(1/2)*y+(1/2)*(1/2)
=(y+1/2)^2
(4)(m+n)⒉—4m(m+n)+4m⒉
=(m+n)*(m+n)-2*2m*(m+n)+(2m)*(2m)
=[(m+n)-2m]^2=(n-m)^2
(5)25a⒉—80a+64
=5a*5a-2*5a*8+8*8
=(5a-8)^2
(6)a⒉+2a(b+a)+(b+c)⒉
= a*a+2*a*(b+a)+ (b+a)^2 (改c应该是a)
=[a+(a+b)]^2
=(2a+b)^2
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