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t²:100=100 /*100
t²=100*100
t²=10000
t=√10000
t=100 ∨ t=-100
t²=100×10²
t²=10000
t=√(10000)=100 v t=-100
t² ÷ 100 = 100 /*100
t² = 10 000
√t² = √10 000
t = 100 v t = -100