Question

900-3X(4+2)-115+9x5-2x(3x3) ,310+4x(6x4)-215+9x8-3+5x6 ,380-5x(2+2)-30+4x5-2x5+3

Answer 1

900-3×(4+2)-115+9×5-2×(3×3)= 900-3×6-115+45-2×9= 900-18-115+45-18= 882-115+27= 767+27=794..... .......310+4×(6×4)-215+9×8-3+5×6= 310+4×24-215+72-3+30= 310+96-215+72-3+30= 406-215+69+30= 191+99=290.......... ........ 380-5×(2+2)-30+4×5-2×5+3= 380-5×4-30+20-10+3= 380-20-30+13=360-30+13=330+13=343

Answer 2

la prima operație era: 

900-3X(    6     ) - 115 + 45 -2X (    9     )=

900-3X      6      - 115 + 45 -2 X (    9    )=

900 - 18 - 150 -18=

882 - 132=750