Kopfrechnen
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Transcript of Kopfrechnen
KOPFRECHNKOPFRECHNENENKOPFGEOMETRIEKOPFGEOMETRIE
3% von 800 3% von 800 ==
5% von 900 5% von 900 ==
13% von 600 13% von 600 ==
14% von 500 + 18 14% von 500 + 18 ==
14% von (500 + 14% von (500 + 100) =100) =
13% von (500 + 13% von (500 + 100) =100) =
13% von (500 - 13% von (500 - 100) =100) =
13% von (500 - 13% von (500 - 200) =200) =
13% von (500 - 200) + 13% von (500 - 200) + 8 =8 =
13% von (500 - 200) - 13% von (500 - 200) - 11 =11 =
3% von (500 - 100) * 3% von (500 - 100) * 2 =2 =
3% von (500 - 100) + 3% von (500 - 100) + 2% von 700 =2% von 700 =
3% von (500 - 100) + 3% von (500 - 100) + 2% von (700+ 200) =2% von (700+ 200) =
3% 3% vonvon (500-100)+x = (500-100)+x = 3535
3% 3% von (500 +300) von (500 +300) + x + x = 35= 35
3%von(500+300)+2x=363%von(500+300)+2x=36
12² + x = 160
12² + 2x = 160
3x + √225 = 21
4x + √169 = 53
(3+x)² = 49
2x + 3 = 2x + 3 = 2525
3x + 13 = 3x + 13 = 3434
5 * 5 * (x+3)=45 (x+3)=45
7 * 7 * (x+3)=63 (x+3)=63
7 * (x-3)=42 7 * (x-3)=42
7 * (x-3) + 5=40 7 * (x-3) + 5=40
8 * (x-3) + 5=29 8 * (x-3) + 5=29
6 * (x-3) + 3=39 6 * (x-3) + 3=39
6 x+ 2 = 3x + 6 x+ 2 = 3x + 17 17
6 x+ 2 = 4x + 6 x+ 2 = 4x + 16 16
8 x+ 2 = 4x + 8 x+ 2 = 4x + 26 26
8 x-2 = 4x + 26 8 x-2 = 4x + 26
11x-2 = 4x + 26 11x-2 = 4x + 26
11x-2 = 4x + 33 11x-2 = 4x + 33
11x-2 = 4x – 3711x-2 = 4x – 37
66° 66°
γ 2 * γ + 38 =
2*c + x = 35
• 6 c
• 8
2*a + x = 21
• a 5
• 4
• y = 5x – 1• y = 2x + 8- ------------