Lời giải:
a) √7.√63=√7.63=√4417.63=7.63=441 = 21
b) √2,5.√30.√48=√2,5.30.48=√36002,5.30.48=2,5.30.48=3600 = 60.
c) √0,4.√6,4=√0,4.6,4=√2,560,4.6,4=0,4.6,4=2,56 = 1,6
d) √2,7.√5.√1,5=√2,7.5.1,5=√20,252,7.5.1,5=2,7.5.1,5=20,25 = 4,5
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Lời giải:
a) √7.√63=√7.63=√4417.63=7.63=441 = 21
b) √2,5.√30.√48=√2,5.30.48=√36002,5.30.48=2,5.30.48=3600 = 60.
c) √0,4.√6,4=√0,4.6,4=√2,560,4.6,4=0,4.6,4=2,56 = 1,6
d) √2,7.√5.√1,5=√2,7.5.1,5=√20,252,7.5.1,5=2,7.5.1,5=20,25 = 4,5
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