x + 135 = 287 x – 78 = 210 327 – x = 225 512 + x = 987 – 41
Giải thích
x + 135= 287
x= 287 – 135
x= 152
x – 78= 210
x= 210 + 78
x= 288
327 – x= 225
x= 327 – 225
x= 102
512 + x= 987 – 41
512 + x= 936
x= 936 - 512
x= 424
x + 135= 287
x= 287 – 135
x= 152
x – 78= 210
x= 210 + 78
x= 288
327 – x= 225
x= 327 – 225
x= 102
512 + x= 987 – 41
512 + x= 936
x= 936 - 512
x= 424