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

Toán Lớp 4: Bài 1: Tính: a) 12300 : 300 b) 54500 : 50 c) 49500 : 90 d) 101040 : 40 Bài 2: T

Toán Lớp 4: Bài 1: Tính:
a) 12300 : 300 b) 54500 : 50 c) 49500 : 90 d) 101040 : 40
Bài 2: Tìm x:
a) x × 30 = 210 b) x × 15 + x × 5 = 2800
c) (x + 15) × 50 = 13700 d) 70 × x – 70 × 28 = 490

Comments ( 2 )

  1. $\text{Bài 1:}$
    $\text{Trong hình:}$
    $\text{Bài 2:}$
    a) x × 30 = 210
    x = 210 : 30
    x = 7
    b) x × 15 + x × 5 = 2800
    x × ( 15 + 5 ) = 2800
    x × 20 = 2800
    x = 2800 : 20
    x = 140
    c) ( x + 15 ) × 50 = 13700
    x + 15 = 13700 : 50
    x = 274 – 15
    x = 259
    d) 70 × x – 70 × 28 = 490
    x × ( 70 – 28 ) = 490
    x × 42 = 490
    x = 490 : 42
    x = 35/3

    toan-lop-4-bai-1-tinh-a-12300-300-b-54500-50-c-49500-90-d-101040-40-bai-2-t

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