1﹚43×7/44
=44×7/44-7/44
=7-7/44
=6又37/44
2﹚7/18×19-7/18
=7/18×﹙19-1﹚
=7/18×18
=7
3﹚10÷2/5-3/4×2/9
=100÷4-1/6
=25-1/6
=24又5/6