Lettervormen distributiviteit

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Bereken

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

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Bereken

Verbetersleutel

1. \(-2(-xy+y-1)=2xy-2y+2\)
2. \(-(-x+2xy+2)=x-2xy-2\)
3. \(-4(7y+2)=-28y-8\)
4. \(-2(-x+4xy-1)=2x-8xy+2\)
5. \(2(3b-1)=6b-2\)
6. \(+(-7p-1)=-7p-1\)
7. \(2(x-xy-1)=2x-2xy-2\)
8. \(-2(2x-xy-2)=-4x+2xy+4\)
9. \(+(7y-2)=7y-2\)
10. \(3(5c-1)=15c-3\)
11. \(+(5x-2)=5x-2\)
12. \(-(-2x+y-3)=2x-y+3\)