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Binciuionutcristian
a fost răspuns

Calculati, scotand factor comun:
a)7x5-7x3; b)2x3+3x8; c)15+15x7; d)7x9-7; e)143x 81+143x11+143x7+143

Răspuns :

Tinaoala2810
7x(5+3)=56 3x(2+8)=30 15x(1+7)=120 7x(9-1)=56 143x(81+11+7+1)=14300
7(5-3)=7x2=14
3(2+8)=3x10=30
15(1+7)=15X8=120
143(81+11+7+1)=143X100=14300

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