Question

5. Efectuează rapid, grupând convenabil factorii: a) 32x4x10x25x5; b) 25x5x8x20; c) 4x8x5x6x5; d) 12x4x10x5x25. va rog nu știu cum să le grupez​

Answer 1

a) 32x4x10x25x5 =

5 * 4 * 25 * 10 * 32 = 5000 * 32 = 160 000

b) 25x5x8x20 =

5 * 20 * 8*25 = 100 * 8 * 25 = 800 * 25 = 20 000

c) 4x8x5x6x5=

30 * 20 * 8 = 600 * 8= 4800

d) 12x4x10x5x25=

20 * 12 * 10 * 25 = 2400 * 25 = 60 000

Answer 2

• 32x4x10x25x5= 32x10x4x25x5= 320x 100x5= 32000x5=160000
•25x5x8x20= 25x8x5x10= 200x 100= 20000
• 4x8x5x6x5=8x5x6x5x4= 40x30x4=1200x4=4800
•12x4x10x5x25=4x25x12x10x5=100x120x5=12000x5=60000