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X x 2 - 100 = 1000
x x 2 = 1000 - 100
x x 2 = 900
x = 900 : 2
x = 450
x : (50 x 5)= 9
x : 250 = 9
x = 9 x 250
x = 2250
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\(1000:\left(x\times25\right)=8\\ x\times25=1000:8\\ x\times25=25\\ x=25:25=1\)
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\(\left(x:30\right)\times8=8\times1350\\ \left(x:30\right)\times8=10800\\ x:30=10800:8\\ x:30=1350\\ x=1350\times30\\ x=40500\)
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( 258 +852 ) x 1000 : 25
= 1110 x 1000 : 25
= 1110000 : 25
= 44400
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1000 + x = 20 + 20
1000 + x = 40
x = 1000 - 40
x = 960
tính nhanh
50 x 2 + 50 x 2 = 200
\(1000+x=20+20\)
\(1000+x=40\)
\(x=40-1000\)
\(x=-960\)
\(50x2+50x2\)
\(=50x\left(2+2\right)\)
\(=50x4\)
\(=200\)
\(K\)\(nha\)\(ban!!!\)
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M = (2 + 4 + 6 + ... + 48 + 50) × (125 × 8 - 1000)
= (2 + 4 + 6 + ... + 48 + 50) × (1000 - 1000)
= (2 + 4 + 6 + ... + 48 + 50) × 0
= 0
Xx25-50=1000
Xx25. =1000-50
Xx25. =950
X. =950:25
X. =430
Vậy X=42