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Bài 2: Tính nhanh
a) 29 + 132 + 237 + 868 + 3
= 29+(132+858)+(237+3)
=29+990+240
=1259
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= 35 . 67 - 167 . 35
= 35 . (67 - 167 )
= 35 . ( -100 )
= -3500
35.67+167.(-35)
=35.67+(-167).35
=35.[67+(-167)]
=35.100=3500
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900 + (-100) mà lại bằng -1000 phải bằng 800 chứ
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35 . 34 + 35 . 38 +5 .28 .7
= 35 . 34 + 35 . 38 + 35 . 28
= 35 .( 34+38+28)
=35.100
=3500
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a) (-25). ( 35-147) + 35. (25-147)
= -875 + 3675 + 875 - 5145
= ( -875 + 875 ) + 3675 - 5145
= 0 + ( - 1470 )
= - 1475
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d = -25 x 35 + -25x 147 + 35 x 25 + 25x 147 = ( -25x35 + 35x25) + ( -25x147 + 25 x147) = 0+0=0
các bạn cho mình vài li-ke cho tròn 400 với
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=115 + 85 +35 - 46 - 35
=200-46+35-35
= 200-46
=154
hok tốt
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a: \(-472+\left(235-28\right)-\left(35-350\right)\)
\(=-472+235-28-35+350\)
\(=\left(-472-28\right)+\left(235-35\right)+350\)
=-500+350+200
=50
b: \(91\cdot172+91\cdot13-91\cdot85\)
\(=91\cdot\left(172+13-85\right)\)
\(=91\cdot100=9100\)
c: \(798-298:\left[19-2\left(5^2-22\right)^2\right]\cdot1^{2023}\)
\(=798-298:\left[19-2\left(25-22\right)^2\right]\)
\(=798-298:\left[19-2\cdot3^2\right]\)
\(=798-298:\left(19-18\right)\)
=798-298
=500
132.(35-207)-35.31+31.207
=132.(35-207)-31.(35+207)
=132.(-172)-31.242
=-22704-7502
=30206
132.(35-207)-35.31+31.207
= 132.35 - 132.207 - 35.31 +31.207
= 35.(132-31) + 207.(31-132)
= 35.101 + 207.(-101)
= 35.201 + (-207).101
= 101.(35-207)
= 101.(-172)
= -17372