Răspuns :
Explicație pas cu pas:
a).53×18+18×49=954+882=1836
18×(53+49)=18×102=1836
b) 378×26-279×26=9828-7254=2574
26×(378-279)=26×99=2574
c) 406×14+14×38=5684+532=6216
14×(406×138)=14+444=6216
87×63-58×63=5481-3654=1827
63×(87-58) =1827
53×18+18×49=
(53×18)+(18×49=
378×26-279×26=
(378×26)-(279×26)=
406×14+14×38=
(406×14)+(14×38)=
87×63-58×63=
(87×63)-(58×63)=
calculezi tu singur/ă