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Toán Lớp 9: `a)`$\sqrt{64x+64}$ `-`$\sqrt{25x+25}$ `+ `$\sqrt{4x+4}$ `=20` `b)` $\sqrt{3x}$ `+5`$\sqrt{27x}$ `-16=` $\sqrt{432x}$

Home/ Toán Lớp 9: `a)`$\sqrt{64x+64}$ `-`$\sqrt{25x+25}$ `+ `$\sqrt{4x+4}$ `=20` `b)` $\sqrt{3x}$ `+5`$\sqrt{27x}$ `-16=` $\sqrt{432x}$

Toán Lớp 9: `a)`$\sqrt{64x+64}$ `-`$\sqrt{25x+25}$ `+ `$\sqrt{4x+4}$ `=20` `b)` $\sqrt{3x}$ `+5`$\sqrt{27x}$ `-16=` $\sqrt{432x}$

Hoàng Hà Tháng Bảy 14, 2022 Toán học 1 Comment 0 views

Toán Lớp 9: a)$\sqrt{64x+64}$ -$\sqrt{25x+25}$ + $\sqrt{4x+4}$ =20
b) $\sqrt{3x}$ +5$\sqrt{27x}$ -16= $\sqrt{432x}$

Comments ( 1 )

huongtructram
14 Tháng Bảy, 2022 at 1:08 chiều

Reply

a)\sqrt{64x+64}-\sqrt{25x+25}+\sqrt{4x+4}=20

<=>\sqrt{64(x+1)}-\sqrt{25(x+1)}+\sqrt{4(x+1)}=20

<=>8\sqrt{x+1}-5\sqrt{x+1}+2\sqrt{x+1}=20

<=>5\sqrt{x+1}=20

<=>\sqrt{x+1}=4

<=>x+1=16

<=>x=15

b)\sqrt{3x}+5\sqrt{27x}-16=\sqrt{432x}

<=>\sqrt{3x}+5\sqrt{9.3x}-\sqrt{144.3x}=16

<=>\sqrt{3x}+5.3.\sqrt{3x}-12\sqrt{3x}=16

<=>4\sqrt{3x}=4

<=>3x=16

<=>x=\frac{16}{3}

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