Răspuns:
a)35×99=35×(100-1)=35×100-35×1=3.500-35=3.456
b)27×101=27×(102-1)=27×102-27×1=2.754-27=2.727
c)15×102=15×(103-1)=15×103-15×1=1.545-15=1.530
d)31×98=31×(99-1)=31×99-31×1=3.069-31=3.038
e)4×999=4×(1.000-1)=4×1.000-4×1=4.000-4=3.996
f)5×1.004=5×(1.005-1)=5×1.005-5×1=5.025-5=5.020
Explicație pas cu pas:
,,,,,,~Succes!☆
