7. Observe the pattern and fill in the blanks.
3²+ 4²+ 12² = 13²
4²+ 5²+ 20² = 21²
6² + 7²+ 42²= 43²
5²+ 6²+ 30²
= 31²
(a) 1²+ 2² + - =
(b) 5² + - + 30² =
(c) _ + 3²+ 6² =
(d) 8² + ------- +------ =73²
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Answer:
- 1²+2²+2²=3²
- 5²+6²+30²=31²
- 2²+3²+6²=7²
- 8²+9²+72²=73²
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