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1)
![sqrt{360 times 490} sqrt{360 times 490}](https://tex.z-dn.net/?f=+sqrt%7B360+times+490%7D+)
=
![sqrt{36 times 100 times 49} sqrt{36 times 100 times 49}](https://tex.z-dn.net/?f=+sqrt%7B36+times+100+times+49%7D+)
=6×10×7=420
2)
![sqrt{331776} sqrt{331776}](https://tex.z-dn.net/?f=+sqrt%7B331776%7D+)
=
![sqrt{36 times 36 times 16 times 16} sqrt{36 times 36 times 16 times 16}](https://tex.z-dn.net/?f=+sqrt%7B36+times+36+times+16+times+16%7D+)
=36×16=576
3)
![sqrt{45 times 80 times 0.16} sqrt{45 times 80 times 0.16}](https://tex.z-dn.net/?f=+sqrt%7B45+times+80+times+0.16%7D+)
=
![sqrt{45 times 8 times 1.6} sqrt{45 times 8 times 1.6}](https://tex.z-dn.net/?f=+sqrt%7B45+times+8+times+1.6%7D+)
=
![sqrt{360 times 1.6} sqrt{360 times 1.6}](https://tex.z-dn.net/?f=+sqrt%7B360+times+1.6%7D+)
=
![sqrt{36 times 16} sqrt{36 times 16}](https://tex.z-dn.net/?f=+sqrt%7B36+times+16%7D+)
=6×4=24
4)
![sqrt{3.6 times 810} sqrt{3.6 times 810}](https://tex.z-dn.net/?f=+sqrt%7B3.6+times+810%7D+)
=
![sqrt{36 times 81} sqrt{36 times 81}](https://tex.z-dn.net/?f=+sqrt%7B36+times+81%7D+)
=6×9=54
=
=6×10×7=420
2)
=
=36×16=576
3)
=
=
=
=6×4=24
4)
=
=6×9=54
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