13×25%+13÷4
=13×(1/4)+13×(1/4)
=13×(1/4+ 1/4)
=13×(1/2)
=6.6
2.4÷240%÷5
=2.4÷2.4÷5
=1÷5
=0.2
1.2×92+7×120%+1.2
=1.2×92+7×1.2+1.2
=1.2×(92+7+1)
=1.2×100
=120