Question

Calculiaza rapid dupa model,folosind proprietatile inmultirii. a) 5×8 5×36 2×45 5×16 modelul 5×12=5×2×6= =10×6 =60. b)36×75 24×75 28×75 36×26 28×25. model 28×75=4×7×3×25= =(4×25)×(7×3)= =100×21= =2100 ajutatima va rog mult

Answer 1

A)5X18=5X2X4=5X2X9=10X9=90
5X36=5X6X6=30X6=180
2X45=2X5X9=10X9=90
5X16=5X4X4=20X4=80
B)36X75=4X9X3X25=(4X25)X(9X3)=100X27=2700
24X75=4X6X3X25=(4X25)X(6X3)=100X18=1800
28X75=4X7X3X25=(4X25)X(7X3)=100X21=2100
36X25=4X9X25=(4X25)X9=100X9=900
28X25=4X7X3X25=(4X25)X7=100X7=700