Question

scoate factor comun:11×15+15×9=; 21×43+57×21=; 32×27+43×32+32×30=; 914×7+914×3=;

Answer 1

11x15+15x9= 15x (11+9)
= 15x 20
= 300

21x43+57x21= 21x (43+57)
= 21x 100
= 2100

32x27+43x32+32x30= 32x(27+43+30)
= 32x 100
= 3200

914x7+914x3= 914x(7+3)
= 914x 10
= 9140