Răspuns :
a=512-236=276
a=645-427=218
a=534-218=316
a=483+207=690
b.
a=314+156=470
a=243+285=528
a=225+312=537
a=532+89=621
c.
a=940-217=723
a=756-285=471
a=513-197=316
a=483-257=226
2.
316+235=551
551-274=277
3.
564-315=249
700-249=451
4.
a+234-123=315
234-123=111
315-111=204
204+234-123=315
5.
500-185=315
a=645-427=218
a=534-218=316
a=483+207=690
b.
a=314+156=470
a=243+285=528
a=225+312=537
a=532+89=621
c.
a=940-217=723
a=756-285=471
a=513-197=316
a=483-257=226
2.
316+235=551
551-274=277
3.
564-315=249
700-249=451
4.
a+234-123=315
234-123=111
315-111=204
204+234-123=315
5.
500-185=315
Notatie: semnul " => " inseamna "rezulta" adica " de aici deducem "
1) a)
236 + a = 512 => a = 512 - 236 = 276
427 + a = 645 => a = 645 - 427 = 218
a + 218 = 534 => a = 534 - 218 = 316
a + 207 = 483 => a = 483 - 207 = 276
1) b)
a - 156 = 314 => a = 314 + 156 = 470
a - 285 = 243 => a = 243 + 285 = 528
a - 312 = 225 => a = 225 + 312 = 537
a - 89 = 532 => a = 532 + 89 = 621
1) c)
940 - a = 217 => a = 940 - 217 = 723
756 - a = 285 => a = 756 - 285 = 471
513 - a = 197 => a = 513 - 197 = 316
483 - a = 257 => a = 483 - 257 = 226
2)(316 + 235) - x = 274
551 - x = 274
x = 551 - 274 = 277
x = 277 (numarul cautat)
3)
x + (564 - 315) = 700
x + 249 = 700
x = 700 - 249 = 451
x = 451 (numarul cautat)
4)
(x + 234) - 123 = 315
x + 234 - 123 = 315
x + 111 = 315
x = 315 - 111 = 204
x = 204 (numarul la care te-ai gandit)
5)
185 + x = 500
x = 500 - 185 = 315
x = 315 castane trebuie sa adune mircea
6) a)
159 + c = 312 => c = 312 - 159 = 153 => c = 153
c - b = 97 => 153 - b = 97 => b = 153 - 97 = 56 => b = 56
a + b = 247 => a + 56 = 247 => a = 247 - 56 = 191 => a = 191
6)b)
c - 95= 135 => c = 135 - 95 = 40 => c = 40
b - c= 177 => b - 40 = 177 => b = 177 + 40 = 217 => b = 217
a - b = 325 => a - 217 = 325 => a = 325 + 217 = 542 => a = 542
6) c)
c - 19 = 87 => c = 87 - 19 = 68 => c = 68
b - c = 129 => b - 68 = 129 => b = 129 + 68 = 197 => b = 197
813 - a = b => 813 - a = 197 => a = 813 - 197 = 616 => a = 616
1) a)
236 + a = 512 => a = 512 - 236 = 276
427 + a = 645 => a = 645 - 427 = 218
a + 218 = 534 => a = 534 - 218 = 316
a + 207 = 483 => a = 483 - 207 = 276
1) b)
a - 156 = 314 => a = 314 + 156 = 470
a - 285 = 243 => a = 243 + 285 = 528
a - 312 = 225 => a = 225 + 312 = 537
a - 89 = 532 => a = 532 + 89 = 621
1) c)
940 - a = 217 => a = 940 - 217 = 723
756 - a = 285 => a = 756 - 285 = 471
513 - a = 197 => a = 513 - 197 = 316
483 - a = 257 => a = 483 - 257 = 226
2)(316 + 235) - x = 274
551 - x = 274
x = 551 - 274 = 277
x = 277 (numarul cautat)
3)
x + (564 - 315) = 700
x + 249 = 700
x = 700 - 249 = 451
x = 451 (numarul cautat)
4)
(x + 234) - 123 = 315
x + 234 - 123 = 315
x + 111 = 315
x = 315 - 111 = 204
x = 204 (numarul la care te-ai gandit)
5)
185 + x = 500
x = 500 - 185 = 315
x = 315 castane trebuie sa adune mircea
6) a)
159 + c = 312 => c = 312 - 159 = 153 => c = 153
c - b = 97 => 153 - b = 97 => b = 153 - 97 = 56 => b = 56
a + b = 247 => a + 56 = 247 => a = 247 - 56 = 191 => a = 191
6)b)
c - 95= 135 => c = 135 - 95 = 40 => c = 40
b - c= 177 => b - 40 = 177 => b = 177 + 40 = 217 => b = 217
a - b = 325 => a - 217 = 325 => a = 325 + 217 = 542 => a = 542
6) c)
c - 19 = 87 => c = 87 - 19 = 68 => c = 68
b - c = 129 => b - 68 = 129 => b = 129 + 68 = 197 => b = 197
813 - a = b => 813 - a = 197 => a = 813 - 197 = 616 => a = 616