Bài 107 trang 28 SBT toán 7 tập 1

Đề bài

Tính:

a) \(\sqrt {81} \)                                 b) \(\sqrt {8100} \)

c) \(\sqrt {64} \)                                 d) \(\sqrt {0,64} \)

e) \({\rm{}}\sqrt {1000000} \)                      g) \(\sqrt {0,01} \)

h) \(\displaystyle \sqrt {{{49} \over {100}}} \)                            i) \(\sqrt {\displaystyle {4 \over {25}}} \)

k) \(\displaystyle \sqrt {{{0,09} \over {121}}} \)

Lời giải

a) \(\sqrt {81}  = 9\)

b) \(\sqrt {8100}  = 90\)

c) \(\sqrt {64}  = 8\) 

d) \(\sqrt {0,64}  = 0,8\)

e) \({\rm{}}\sqrt {1000000}  = 1000\) 

g) \(\sqrt {0,01}  = 0,1\)

h) \(\displaystyle \sqrt {{{49} \over {100}}}  = {7 \over {10}}\)     

i) \(\displaystyle \sqrt {{4 \over {25}}}  = {2 \over 5}\)

k) \(\displaystyle \sqrt {{{0,09} \over {121}}}  = {{0,3} \over {11}} = {3 \over {110}}\)


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