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

Toán Lớp 4: 245:x+35:x=5 X×15+x×15=560×45 X×125-x×73=1196

Toán Lớp 4: 245:x+35:x=5
X×15+x×15=560×45
X×125-x×73=1196

Comments ( 2 )

  1. a)245:x+35:x=5
    (245+35):x=5
    280:x=5
    x=280:5
    x=56
    b)x×15+x×15=560×45
    x×(15+15)=25200
    x×30=25200
    x=25200:30
    x=840
    c)x×125-x×73=1196
    x×(125-73)=1196
    x×52=1196
    x=1196:52
    x=23

  2. Giải đáp:
    $\text{a/ x = 56 ; b/ x = 840 ; c/ x = 23}$
    Lời giải và giải thích chi tiết:
    $\text{a/ 245 : x + 35 : x = 5}$ $\\$ $\text{⇔ (245 + 35) : x = 5}$ $\\$ $\text{⇔ 280 : x = 5}$ $\\$ $\text{⇔ x = 280 : 5}$ $\\$ $\text{⇔ x = 56}$ $\\$ $\text{b/ X × 15 + x × 15 = 560 × 45}$ $\\$ $\text{⇔ X x (15 + 15) = 25200}$ $\\$ $\text{⇔ X x 30 = 25200}$ $\\$ $\text{⇔ X = 25200 : 30}$ $\\$ $\text{⇔ X = 840}$ $\\$ $\text{c/ X × 125 – x × 73 = 1196}$ $\\$ $\text{⇔ X x (125 – 73) = 1196}$ $\\$ $\text{⇔ X x 52 = 1196}$ $\\$ $\text{⇔ X = 1196 : 52}$ $\\$ $\text{⇔ X = 23}$

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