2.5÷(1.25÷0.4)簡便計算
2.5÷(1.25÷0.4)
=2.5÷1.25×0.4
=2×0.4
=0.8
25分之23×4分之1+4分之1×25分之2用簡便計算
25分之23×4分之1+4分之1×25分之2
=1/4(23/25+2/25)
=1/4*1
=1/4
(2.5+1.25+0.075)×4簡便計算
(2.5+1.25+0.075)×4
=2.5×4+1.25×4+0.075×4
=10+5+0.3
=15.3