2次方程式の解の公式
Palabras clave
mathematical,
formula,
formula,
school,
learn,
route,
undo,
release,
class,
way,
response,
school,
calculation,
working out,
study,
learning,
difficulty,
exam,
figure,
equality,
homework,
difficult,
training,
white background,
vector,
illustration,
graphic