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285+491+15=285+15+491=300+491=791
19+63+31+37=50+100=150
b)689x2x5=689x10=2890
5x47x2=10x47=470
2x283x5x10=10x10x283=100x283=28300
c) 436x4x25=100x436=43600
25x738x4=100x738=73800
5x69x5x4=25x69x4=100x69=6900
mam nadzieję że pomogłam :)
300+491=791
50+100=150
b)689x10=6890
10x47=470
10x283x10=100x283=28300
c)436x100=43600
100x738=73800
69x100=6900