小括号口算题小括号口算题姓名姓名: 年级年级:10+(25+5)= 35 +(15-9)= 20+(30-8)=50-(2+5)= 64-(13+7)= 38+(27-20)=9+(30+17)= 17+(60-30)= 28+(28-8)=39+(70-60)= 80-(37-7)= 1+(45+5)=12+(49-9)= 40+(6+7)= 24+(33-3)=65-(20-10)= 60-(13-9)= 66+(2+7)=49+(19-10)= 60-(10-9)= 50+(40-30)=25-(14-8)= 80-(10+50)= 14+(15-8)=10+(20-8)= 20+(53-40)= 7+(8+9)=32-(17-10)= 35-(4+5)= 24+(9-6)=23+(55-50)= 89-(90-30)= 20+(2+8)=91-(51+9)= 41-(10-1)= 10+(18+5)=