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(540:60+231) : 15-1000:8:25=

12 900:100 - (500-350:7*9) : 10=

(810:3-120) : 6+8 * (172:4-20) =

(345 720-72 045*4) : 10*3=

(25 812*3-109*4) : 1000=

(540:60+231) : 15-1000:8:25 = (9+231) : 15-125:25=240:15-5=16-5=11

12 900:100 - (500-350:7*9) : 10=129 - (500-50*9) = 129 - (500-450) = 129-50=79

(810:3-120) : 6+8 * (172:4-20) = (270-120) : 6+8 * (43-20) = 150:6+8*23=25+184=209

(345 720-72 045*4) : 10*3 = (345 720-288 180) : 10*3=57540:10*3=5754*3=

=17262

(25 812*3-109*4) : 1000 = (77436-436) : 1000=77000:1000=77