作业帮若A^2+2b=3 5a^2+10b=( ) -a^2-2b=( ) -3a^2-6b=( ) 若b/a=3 4b/3a=（ ）a/6b=( )若x^2+x=13x^2+3x 3x^2+3x-5 若a+b/a-b=3(a+b)/(a-b)-[4(a-b)]/(a+b)若x+2y^2+5=73x+6y^2+4
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![若A^2+2b=3 5a^2+10b=( ) -a^2-2b=( ) -3a^2-6b=( ) 若b/a=3 4b/3a=（ ）a/6b=( )若x^2+x=13x^2+3x 3x^2+3x-5 若a+b/a-b=3(a+b)/(a-b)-[4(a-b)]/(a+b)若x+2y^2+5=73x+6y^2+4](/uploads/image/z/1125431-71-1.jpg?t=%E8%8B%A5A%5E2%2B2b%3D3+5a%5E2%2B10b%3D%28+%29+-a%5E2-2b%3D%28+%29+-3a%5E2-6b%3D%28+%29+%E8%8B%A5b%2Fa%3D3+4b%2F3a%3D%EF%BC%88+%EF%BC%89a%2F6b%3D%28+%29%E8%8B%A5x%5E2%2Bx%3D13x%5E2%2B3x+3x%5E2%2B3x-5+%E8%8B%A5a%2Bb%2Fa-b%3D3%28a%2Bb%29%2F%28a-b%29-%5B4%28a-b%29%5D%2F%28a%2Bb%29%E8%8B%A5x%2B2y%5E2%2B5%3D73x%2B6y%5E2%2B4)
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若A^2+2b=3 5a^2+10b=( ) -a^2-2b=( ) -3a^2-6b=( ) 若b/a=3 4b/3a=（ ）a/6b=( )若x^2+x=13x^2+3x 3x^2+3x-5 若a+b/a-b=3(a+b)/(a-b)-[4(a-b)]/(a+b)若x+2y^2+5=73x+6y^2+4
若A^2+2b=3 5a^2+10b=( ) -a^2-2b=( ) -3a^2-6b=( ) 若b/a=3 4b/3a=（ ）a/6b=( )
若x^2+x=1
3x^2+3x 3x^2+3x-5
若a+b/a-b=3
(a+b)/(a-b)-[4(a-b)]/(a+b)
若x+2y^2+5=7
3x+6y^2+4
若A^2+2b=3 5a^2+10b=( ) -a^2-2b=( ) -3a^2-6b=( ) 若b/a=3 4b/3a=（ ）a/6b=( )若x^2+x=13x^2+3x 3x^2+3x-5 若a+b/a-b=3(a+b)/(a-b)-[4(a-b)]/(a+b)若x+2y^2+5=73x+6y^2+4
5a^2+10b=5*(a^2+2b)=5*3=15
-a^2-2b=-1(a^2+2b)=-1*3=-3
-3a^2-6b=-3a^2+(-3)2b=-3( a^2+2b)=-3*3=-9
若b/a=3 4b/3a=4/3*b/a=4/3*3=4
因为b/a=3,所以a/b=1/3,
a/6b=1/6*a/b=1/6*1/3=1/18