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

Toán Lớp 4: Thực hiện phép tính ( tính nhanh nếu có thể ) A.253 x 284 + 253 x 482 + 253 x 234 B.672 x 100 – 276 x 50 + 336 x 500

Toán Lớp 4: Thực hiện phép tính ( tính nhanh nếu có thể )
A.253 x 284 + 253 x 482 + 253 x 234
B.672 x 100 – 276 x 50 + 336 x 500

Comments ( 2 )

  1. a) 253 × 284 + 253 × 482 + 253 × 234
    = 253 × (284 + 482 + 234)
    = 253 × 1000
    = 253000
    b) 672 × 100 – 276 × 50 + 336 × 500
    = 672 × 2 × 50 – 276 × 50 + 336 × 10 × 50
    = 1344 × 50 – 276 × 50 + 3360 × 50
    = 50 × (1344 – 276 + 3360)
    = 50 × 4428
    = 221400

  2. a)253 xx 284 + 253 xx 482 + 253 xx 234
    =253xx(284+482+234)
    =253xx1000
    =25000
    b)672 xx 100 – 276 xx 50 +  336 xx 500
    =672xx2xx50-276xx50+336xx10xx50
    =1344xx50-276xx50+3360xx50
    =(1344-276+3360)xx50
    =4428xx50
    =221400
     

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

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