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
