Toán Lớp 7: 1) √40 + √1000 + √160
2)√98 + √242 – √2000
3)√500 – √320 +√720
4)√80 + √180 – √320
5)√700 – √175 + √605
Giúp em vs ạ
Hạn cuối 8h tối
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Toán Lớp 7: 1) √40 + √1000 + √160
2)√98 + √242 – √2000
3)√500 – √320 +√720
4)√80 + √180 – √320
5)√700 – √175 + √605
Giúp em vs ạ
Hạn cuối 8h tối
Comments ( 2 )
= \sqrt{4 . 10} + \sqrt{100.10} + \sqrt{16.10}
= 2\sqrt{10} + 10\sqrt{10} + 4\sqrt{10}
= 16\sqrt{10}
_____________
2, \sqrt{98} + \sqrt{242} – \sqrt{2000}
= \sqrt{49.2} + \sqrt{121 . 2} – \sqrt{400.5}
= 7\sqrt{2} + 11\sqrt{2} – 20\sqrt{5}
= 18\sqrt{2} – 20\sqrt{5}
____________
3, \sqrt{500} – \sqrt{320} + \sqrt{720}
= 10\sqrt{5} – 8\sqrt{5} + 12\sqrt{5}
= 14\sqrt{5}
4, \sqrt{80} + \sqrt{180} – \sqrt{320}
= 4\sqrt{5} + 6\sqrt{5} – 8\sqrt{5}
= 2\sqrt{5}
________
5, \sqrt{700} – \sqrt{175} + \sqrt{605}
= \sqrt{100.7} – \sqrt{25.7} + \sqrt{121.5}
= 10\sqrt{7} – 5\sqrt{7} + 11\sqrt{5}
= 5\sqrt{7} + 11\sqrt{5}