Lettervormen distributiviteit

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Bereken

1. \(-2(-xy+3y+4)\)
2. \(-(-2x-2xy+4)\)
3. \(-(3y+1)\)
4. \(-3(-8b-2)\)
5. \(-2(7b+2)\)
6. \(-(-3x-4xy+1)\)
7. \(2(-y-1)\)
8. \(-2(-2b+2)\)
9. \(-2(5a-1)\)
10. \(+(a+2)\)
11. \(-2(-2xy+4y+1)\)
12. \(-(4y+2)\)

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Bereken

Verbetersleutel

1. \(-2(-xy+3y+4)=2xy-6y-8\)
2. \(-(-2x-2xy+4)=2x+2xy-4\)
3. \(-(3y+1)=-3y-1\)
4. \(-3(-8b-2)=24b+6\)
5. \(-2(7b+2)=-14b-4\)
6. \(-(-3x-4xy+1)=3x+4xy-1\)
7. \(2(-y-1)=-2y-2\)
8. \(-2(-2b+2)=4b-4\)
9. \(-2(5a-1)=-10a+2\)
10. \(+(a+2)=a+2\)
11. \(-2(-2xy+4y+1)=4xy-8y-2\)
12. \(-(4y+2)=-4y-2\)