1.5●70=350
2.720:90=8
3.450:90=5
4. 8-5=3
5.3*20=60
6.350-60=290
2..14●5-(128:8-80:5):19-20
1.14*5=70
2.128:8=16
3.80:5=16
4.16-16=0
5.0:19= 0
6. 70-0=70
7.70-20=50
3.128:8+171:19+133:7+15
1.128:8=16
2.171:19=9
3.133:7=19
4.16+9=25
5.25+19=44
6,44+15=59