(1)
①76+14=
②45-7=
③60-16=
④37+28+15=
⑤71-23-39=
⑥40-13+66=
12÷2= 64÷8= 18÷6= 54÷9= 42÷7=
78+24= 81+9= 48-8= 42-6= 27+11=