6.37-0.81-(2.19-1.63)
=6.37-0.81-2.19+1.63
=(6.73+1.63)-(0.81+2.19)
=8-3
=5
(七分之一+七分之四x八分之一)除以七分之一
=(1/7+1/7×4/8)÷1/7
=1/7×(1+1/2)÷1/7
=3/2
=1.5
6.37-0.81-(2.19-1.63)
=6.37-0.81-2.19+1.63
=(6.73+1.63)-(0.81+2.19)
=8-3
=5
(七分之一+七分之四x八分之一)除以七分之一
=(1/7+1/7×4/8)÷1/7
=1/7×(1+1/2)÷1/7
=3/2
=1.5