480-(52+23X12)=480-(52+23X10+23X2)=480-(230+52+46)=480-230-98=250-100+2=152
数学,遇到小括号先算小括号裏面的
480-(52+23×12)=480-(40+12+23×12)=480-{40+12×(1+23)}=480-(40+12×24)=480-40-288=440-200-88=240-88=152