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数学

A laptop and an open textbook on a desk
@naosami

yslab

Image showing the reflection of a hand through a camera lens
ユウ3850

ユウ3850

An antique abacus resting on a wooden floor
tamu1500

tamu1500

An elderly man and a child selecting colorful toys at a festival
っぽ

っぽ

Abstract image of colorful swirling lights around a lens
@koto_bridge

琴橋

Workspace featuring a coffee cup and laptop
@naosami

yslab

Laptop on a desk with a coffee cup glasses and a smartphone visible
@naosami

yslab

A pink ball and numbered polyhedra on a wooden table
かめです

かめです

Mathematical calculations and notes written in a notebook
かめです

かめです

Image of a traditional abacus with various colored beads arranged
mire2024

mire2024

Close-up of a wooden abacus featuring smooth grains and reddish-brown beads
mire2024

mire2024

Blue timer with digital display pen and notebook on wooden table
かめです

かめです

A blue notebook and a calculator placed on a wooden table
ぽて

ぽて

A vast blue night sky filled with countless stars
@studioyehman

やーまん