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

Toán Lớp 6: 11: tìm x a, x – 5 = -1 b,x + 30 = – 4 c, x – ( – 24 ) = 3 d, 15 – ( 4 – x ) = 6 e, 175 – 5 ( x + 3 ) = 85 g, x mũ 2 = 4

Home/ Toán Lớp 6: 11: tìm x a, x – 5 = -1 b,x + 30 = – 4 c, x – ( – 24 ) = 3 d, 15 – ( 4 – x ) = 6 e, 175 – 5 ( x + 3 ) = 85 g, x mũ 2 = 4

Toán Lớp 6: 11: tìm x a, x – 5 = -1 b,x + 30 = – 4 c, x – ( – 24 ) = 3 d, 15 – ( 4 – x ) = 6 e, 175 – 5 ( x + 3 ) = 85 g, x mũ 2 = 4

Tháng Năm 21, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: 11: tìm x
a, x – 5 = -1
b,x + 30 = – 4
c, x – ( – 24 ) = 3
d, 15 – ( 4 – x ) = 6
e, 175 – 5 ( x + 3 ) = 85
g, x mũ 2 = 4

Comments ( 2 )

  1. maingocquynhnhu2k1
    maingocquynhnhu2k1
    21 Tháng Năm, 2022 at 10:04 chiều
    Reply
    $a,$ $x-5=-1$
    $⇒x-5+5=-1+5$
    $⇒x=4$
    Vậy $x=4$
    $b,$ $x+30=-4$
    $⇒x+30-30=-4-30$
    $⇒x=-34$
    Vậy $x=-34$
    $c,$ $x-\left(-24\right)=3$
    $⇒x+24=3$
    $⇒x+24-24=3-24$
    $⇒x=-21$
    Vậy $x=-21$
    $d,$ $15-\left(4-x\right)=6$
    $⇒15-\left(4-x\right)-15=6-15$
    $⇒-\left(4-x\right)=-9$
    $⇒\dfrac{-\left(4-x\right)}{-1}=\dfrac{-9}{-1}$
    $⇒4-x=9$
    $⇒4-x-4=9-4$
    $⇒-x=5$
    $⇒\dfrac{-x}{-1}=\dfrac{5}{-1}$
    $⇒x=-5$
    Vậy $x=-5$
    $e,$ $175-5\left(x+3\right)=85$
    $⇒175-5\left(x+3\right)-175=85-175$
    $⇒-5\left(x+3\right)=-90$
    $⇒\dfrac{-5\left(x+3\right)}{-5}=\dfrac{-90}{-5}$
    $⇒x+3=18$
    $⇒x+3-3=18-3$
    $⇒x=15$
    Vậy $x=15$
    $g,$ $x^2=4$
    \(⇒\left[ \begin{array}{l}x=\sqrt{4}\\x=-\sqrt{4}\end{array} \right.\)
    \(⇒\left[ \begin{array}{l}x=2\\x=-2\end{array} \right.\) 
    Vậy $x=2$ $hoặc$ $x=-2$
     

  2. ankim
    ankim
    21 Tháng Năm, 2022 at 10:03 chiều
    Reply
    Giải đáp:
    $\text{a/ 4; b/ -43; c/ -21; d/ -5; e/ 2}$ 
    Lời giải và giải thích chi tiết:
    $\text{a/ x – 5 = -1}$ $\\$ $\text{⇔ x = -1 + 5}$ $\\$ $\text{⇔ x = 4}$ $\\$ $\text{b/ x + 30 = -4}$ $\\$ $\text{⇔ x = -4 – 30}$ $\\$ $\text{⇒ x = -43}$ $\\$ $\text{c/ x – (-24) = 3}$ $\\$ $\text{⇔ x + 24 = 3}$ $\\$ $\text{⇔ x = 3 – 24}$ $\\$ $\text{⇒ x = -21}$ $\\$ $\text{d/ 15 – (4 – x) = 6}$ $\\$ $\text{⇔ 15 – 4 + x = 6}$ $\\$ $\text{⇔ 11 + x = 6}$ $\\$ $\text{⇔ x = 6 – 11}$ $\\$ $\text{⇒ x = -5}$ $\\$ $\text{e/ 175 – 5(x + 3) = 85}$ $\\$ $\text{⇔ 5(x + 3) = 175 – 85}$ $\\$ $\text{⇔ 5(x + 3) = 90}$ $\\$ $\text{⇔ x + 3 = 90 : 5}$ $\\$ $\text{⇔ x + 3 = 18}$ $\\$ $\text{⇔ x = 18 – 3}$ $\\$ $\text{⇒ x = 15}$ $\\$ $\text{g/ x² = 4}$ $\\$ $\text{⇔ x² = 2²}$ $\\$ $\text{⇒ x = 2 hoặc x = -2}$
     

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

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