12.34х-8.46х+2.62
3.88х+2.62
3.88*0.07+2.62=2.8916
1)8+2=10
2)64×10=640
3)36×9=324
4)640-549=91
5)91+324=415
Х-25=25+3
х-25=28
х=28+25
х=53
Ответ: 5; -13; -9
Пошаговое объяснение:
1целая 1/2 × (-5) × (-2/3) = 3/2 × (-2/3) × (-5) = -1 × (-5) = 5
3/8 × (-13) × 2целых 2/3 = 3/8 × 8/3 × (-13) = 1 × (-13) = -13
-1целая 3/7 × (-9) × (-7/10) = -10/7 × (-7/10) × (-9) = 1 × (-9) = -9