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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: 1.Tìm x 4x^2-1=0 2.Tính -4.√4/25 +3.√0,16 -2.√0,004

Toán Lớp 7: 1.Tìm x
4x^2-1=0
2.Tính
-4.√4/25 +3.√0,16 -2.√0,004

Comments ( 1 )

  1. 1. Tìm x
    $4x^{2}$  – 1 = 0
    $4x^{2}$ = 1
    $x^{2}$  = $\frac{1}{4}$ 
    $x^{2}$  = ($\frac{1}{2}$)$^{2}$ 
     x = $\frac{1}{2}$
    2.Tính
    -4 . $\sqrt{\frac{4}{25} }$ . $\sqrt{0,16 }$ . $\sqrt{0,004 }$
    $\approx$ -4 . $\frac{2}{5}$  + 3 . $\frac{2}{5}$  – 2 . 0,0632
    $\approx$ $\frac{2}{5}$. (-4 + 3 ) – 0,1264
    $\approx$ – $\frac{2}{5}$ – 0,1264
    $\approx$ -0,5264
    Chúc bạn học tốt.

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222-9+11+12:2*14+14 = ? ( )