Question

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Answer 1

Explicație pas cu pas:

11. a) n/2=8/n ==>

n²=2×8

n²=16 ==>

n²=4² ==>

n=4

b) 12/n=n/3 ==>

12×3=n²

n²=36 ==>

n²=6² ==>

n=6

c) 3n/5=15/n ==>

3n²=5×15

3n²=75 ==>

n²=75÷3

n²=25 ==>

n²=5² ==>

n=5

d) 2n/7=14/n ==>

2n²=7×14

2n²=98 ==>

n²=98÷2

n²=49 ==<

n²=7² ==>

n=7

e) n/20=5/n ==>

n²=20×5

n²=100 ==>

n²=10² ==>

n=10

f) n/3=3/n ==>

n²=3² ==>

n=3

g) n/100=1/n ==>

n²=100 ==>

n²=10² ==>

n=10

h) 3n/2=96/n ==>

3n²=2×96

3n²=192 ==>

n²=192÷3

n²=64 ==>

n²=8² ==>

n=8

i) 1×2×3×n/5×6×7=5/7n ==>

1×2×3×7n²=5×6×7×5

42n²=1050 ==>

n²=1050÷42

n²=25 ==>

n²=5² ==>

n=5