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1) \(\left(3x+2\right)^2-4\\ =\left(3x+2\right)^2-2^2\\ =\left(3x+2-2\right)\left(3x+2+2\right)\\ =3x.\left(3x+4\right)\)
2) \(4x^2-25y^2=\left(2x\right)^2-\left(5y\right)^2=\left(2x-5y\right)\left(2x+5y\right)\)
3) \(4x^2-49=\left(2x\right)^2-7^2=\left(2x-7\right)\left(2x+7\right)\)
4) \(8z^3+27=\left(2z\right)^3+3^3=\left(2z+3\right)\left(4z^2+6z+9\right)\)
5) \(\dfrac{9}{25}x^4-\dfrac{1}{4}=\left(\dfrac{3}{5}x^2\right)^2-\left(\dfrac{1}{2}\right)^2=\left(\dfrac{3}{5}x^2-\dfrac{1}{2}\right)\left(\dfrac{3}{5}x^2+\dfrac{1}{2}\right)\)
6) \(x^{32}-1\\ =\left(x^{16}\right)^2-1^2\\ =\left(x^{16}-1\right)\left(x^{16}+1\right)\\ =\left(x^8-1\right)\left(x^8+1\right)\left(x^{16}+1\right)\\ =\left(x^4-1\right)\left(x^4+1\right)\left(x^8+1\right)\left(x^{16}+1\right)\\ =\left(x^2-1\right)\left(x^2+1\right)\left(x^4+1\right)\left(x^8+1\right)\left(x^{16}+1\right)\\ =\left(x-1\right)\left(x+1\right)\left(x^2+1\right)\left(x^4+1\right)\left(x^8+1\right)\left(x^{16}+1\right)\)
1: \(\left(3x+2\right)^2-4=3x\left(3x+4\right)\)
2: \(4x^2-25y^2=\left(2x-5y\right)\left(2x+5y\right)\)
3: \(4x^2-49=\left(2x-7\right)\left(2x+7\right)\)
4: \(8z^3+27=\left(2z+3\right)\left(4z^2-6z+9\right)\)
5: \(\dfrac{9}{25}x^4-\dfrac{1}{4}=\left(\dfrac{3}{5}x^2-\dfrac{1}{2}\right)\left(\dfrac{3}{5}x^2+\dfrac{1}{2}\right)\)
a)364+225+436=(364+436)+225=800+225=1025
b)125x14x25x8x4=(125x8)x(25x4)x14=1000x100x14=100000x14=1400000
câu c bạn ra đề sai rồi để mk sửa lại rồi làm luôn.
sửa c) 36x49+64x49=(36+64)x49=100x49=4900
tk nha
\(364+225+436\)
\(=\left(364+436\right)+225\)
\(=800+225\)
\(=1025\)
x = 81 !!!!!
\(x+49=130\)
=> \(x=130-49\)
=> \(x=81\)