Tính nhanh nếu có thể a, $(-2)^{2}$ × ( -25 ) × ( +5 ) × ( -4 ) b, 11 × 62 ± 12 × ( -11 ) + 50 × 11 c, 2 × ( -4 – 14 ) ÷ ( -3 )

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1. `a,(−2)^2 × ( -25 ) × ( +5 ) × ( -4 )`

   `=4 × ( -25 ) × ( 5 ) × ( -4 )`

   `=(4 ×5) xx( -25 × ( -4 ))`

   `=20xx100`

   `=2000`

   `b, 11 × 62 + 12 × ( -11 ) + 50 × 11`

   `= 11 ×( 62 -12 + 50)`

   `=11xx100`

   `=1100`

   `c, 2 × ( -4 – 14 ) ÷ ( -3 ) `

   `= 2 × (-18) ÷ ( -3 ) `

   `=(-36)-:(-3)`

   `=12`

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2. `a)(-2)^2 .(-25).5.(-4)`

   `=4.(-25).5.(-4)`

   `=(4.5).[(-25).(-4)]`

   `=20.100=2000`

   `b)11.62+12.(-11)+50.11`

   `=11.(62-12+50)`

   `=11.100=1100`

   `c)2.(-4-14):-3`

   `=2.(-18):-3`

   `=-36:-3=12`

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