[79×(1/3+0.72)-0.3]×(1/10-0.1)簡便計算

[79×(1/3+0.72)-0.3]×(1/10-0.1)簡便計算

[79×(1/3+0.72)-0.3]×(1/10-0.1)
=[79×(1/3+0.72)-0.3]×0
=0