Explicație pas cu pas:
1. 4x 35 + 4x 52 + 4x 13 = 4×(35+52 + 13) = 4 ×100= 400
2. 9x15+ 15 ×6+ 5x 15 = 15 x ( 9+ 6+6) =
15 x 21 = 36
3. 12 x 91 - 12x44 - 12 x 17 =
12 x( 91 - 44 - 17) = 12 x 30 = 360
4. 113 x 58 - 15 x 113 - 113 x 43 =
113 x ( 58- 15 - 43) = 113 x0 = 0