Toán Lớp 9: Trình bày đầy đủ
M_x + M_y = 241
M_x + M_z = 249
M_y + M_z = 332
Tìm M_x ; M_y ; M_z
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Toán Lớp 9: Trình bày đầy đủ
M_x + M_y = 241
M_x + M_z = 249
M_y + M_z = 332
Tìm M_x ; M_y ; M_z
Comments ( 2 )
M_x +M_z =249
M_y + M_z =332
=>M_x + M_y +M_x +M_z +M_y +M_z =241+249+332
=>2 . ( M_x + M_y + M_z )=822
=>M_x + M_y + M_z =411
M_x + M_y =241
=>M_x + M_y + M_z -(M_x +M_y )=411-241
=>M_z =170
M_y + M_z =332
=>M_y + M_z – M_z =332-170
=>M_y =162
M_y + M_x =241
=>M_y + M_x – M_y =241 -162
=>M_x =79
Vậy M_x =79 ; M_y =162 ; M_z =170