1.2×42-（4.46+0.14）
＝1x42+0.2x42-4.6
=42+8.4-4.6
=50.4-4.6
=45.8
9.6+1÷3-2/3
=9.6+1/3-2/3
=9+3/5-1/3
=9+9/15-5/15
=9又 4/15
0.575×19+1.9×4.25
＝1.9x5.75+1.9x4.25
=1.9x(5.75+4.25)
=1.9x10
=19
（7+7/15）÷7/5-1/3
=（7+7/15）x15/7-1/3
=7x15/7+7/15x15/7-1/3
=15+1-1/3
=15又2/3