c. (√10-√7)*(√10+√7)=(√10)²-(√7)²=10-7=3.
d. (2√3+3√2)*(2√3-3√2)=(2√3)²-(3√2)²=12-18=-6.
5.
а. √21≈4,58 ⇒
4,5<√21<4,6
b) π/2≈1,57808 ⇒
1,5<π/2<1,6.
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c. (√10-√7)*(√10+√7)=(√10)²-(√7)²=10-7=3.
d. (2√3+3√2)*(2√3-3√2)=(2√3)²-(3√2)²=12-18=-6.
5.
а. √21≈4,58 ⇒
4,5<√21<4,6
b) π/2≈1,57808 ⇒
1,5<π/2<1,6.