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1. \(3-\sqrt{657-8.9^2}\)
2. \(4.4^2+(4.4)^2\)
3. \(42-6:2+1\)
4. \(-20.18^2+17\)
5. \(10+5.(8^2-11)\)
6. \((-5).(-6)+2\)
7. \(5.(-2)-6.(-7)-2\)
8. \(6-\sqrt{304-3.4^2}\)
9. \(3.4^2+(3.4)^2\)
10. \(4-\sqrt{214-5.3^2}\)
11. \(3-\sqrt{340-9.6^2}\)
12. \(-21:7+42:(-6)\)

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Verbetersleutel

1. \(3-\sqrt{657-8.9^2}=3-\sqrt{657-8.81}=3-\sqrt{657-648}=3-\sqrt{9}=3-3=0\)
2. \(4.4^2+(4.4)^2=4.4^2+(16)^2=4.16+256=64+256=320\)
3. \(42-6:2+1=42-3+1=40\)
4. \(-20.18^2+17=-20.324+17=-6480+17=-6463\)
5. \(10+5.(8^2-11)=10+5.(64-11)=10+5.(53)=10+265=275\)
6. \((-5).(-6)+2=30+2=32\)
7. \(5.(-2)-6.(-7)-2=-10+42-2=30\)
8. \(6-\sqrt{304-3.4^2}=6-\sqrt{304-3.16}=6-\sqrt{304-48}=6-\sqrt{256}=6-16=-10\)
9. \(3.4^2+(3.4)^2=3.4^2+(12)^2=3.16+144=48+144=192\)
10. \(4-\sqrt{214-5.3^2}=4-\sqrt{214-5.9}=4-\sqrt{214-45}=4-\sqrt{169}=4-13=-9\)
11. \(3-\sqrt{340-9.6^2}=3-\sqrt{340-9.36}=3-\sqrt{340-324}=3-\sqrt{16}=3-4=-1\)
12. \(-21:7+42:(-6)=-3+(-7)=-10\)