ABCDCâu 21 pointABCDCâu 31 pointABCDCâu 41 pointABCDCâu 51 pointABCDCÂU 61 pointABCDCâu 71 pointABCDCâu 81 pointABCDCâu 91 pointABCDCâu 101 pointABCDCâu 111 pointABCDCâu 121 pointABCDCâu 131 pointABCDCâu 141 pointABCDCâu 151 pointABCDCâu 161 pointABCDCâu 171 pointABCDCâu 181 pointABCDCâu 191 pointABCDCâu 201 pointABCDCâu 211 pointABCDCâu 221 pointABCDCâu 231 pointABCDCâu 241 pointABCDCâu 251 pointABCDCâu 261 pointABCDCâu 271 pointABCDCâu 281 pointABCDCâu 291 pointABCDCâu 301 pointABCDCâu 311 pointABCDCâu 321 pointABCDCâu 331 pointABCDCâu 341 pointABCDCâu 351 pointABCDCâu 361 pointABCDCâu 371 pointABCDCâu 381 pointABCDCâu 391 pointABCDCâu 401 pointABC

Câu 13 pointsABCDClear selectionCâu 23 pointsABCDClear selectionCâu 32 pointsABCDClear selectionCâu 42 pointsABCDClear selectionCâu 53 pointsABCDCâu 63 pointsABCDCâu 73 pointsABCDCâu 83 pointsABCDCâu 93 pointsABCDCâu 103 pointsABCDCâu 113 pointsABCDCâu 122 pointsABCDCâu 133 pointsABCDCâu 143 pointsABCDCâu 153 pointsABCDCâu 163 pointsABCDCâu 173 pointsABCDCâu 183 pointsABCDCâu 193 pointsABCDCâu 203 pointsABCDCâu 213 pointsABCDCâu 223 pointsABCDCâu 233 pointsABCDCâu 243 pointsABCDCâu 252 pointsABCDCâu 26 *2 pointsABCDCâu 273 pointsABCDCâu 283 pointsABCDCâu 293 pointsABCDCâu 303 pointsABCDCâu 313 pointsABCDCâu 323 pointsABCDCâu 333 pointsABCDCâu 343 pointsABCDCâu 353 pointsABCD

rút gọn biểu thức (x-5)(x+5)+x(8-x)