Ответ:
1)√17²-8² < 17-8
√17²-8² - √(17-8)(17+8) + √9+25=√9+√25=√34=3+5=8=17-8=9
8<9
2)√4²+8²<4+8
√4²+8²=√16+64=√80=9√16×5-4√5
4√5<12
4)√21,8²-18,2² и 21,8-18,2
√21,8²-18,2=√21,8-18-42+21,8+18,2=√3,6+40=21,8
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Ответ:
1)√17²-8² < 17-8
√17²-8² - √(17-8)(17+8) + √9+25=√9+√25=√34=3+5=8=17-8=9
8<9
2)√4²+8²<4+8
√4²+8²=√16+64=√80=9√16×5-4√5
4√5<12
4)√21,8²-18,2² и 21,8-18,2
√21,8²-18,2=√21,8-18-42+21,8+18,2=√3,6+40=21,8