Răspuns :
12+15-14+37-48=
=27-14+37-48
=13+37-48
=50-48=2
19+(42-18)-2×9
=10+24-18
=34-18
=16
4×3+15-7×2+37-8×6=12+15-14+37-48=
13+37-48=
50-48=2
19+(6×7-18)-2×9=
19+(42-18)-18=
19+24-18=25
13+37-48=
50-48=2
19+(6×7-18)-2×9=
19+(42-18)-18=
19+24-18=25