Răspuns :
1)
Metoda figurativa:
a+b=130
a:b=3 rest 10
a=3b+10
a I.........I............I.........I+10
b I.........I acolada 130
130-10=120(patru parti egale)
120:4=30(b)
30*3+10=90+10=100(a)
Metoda figurativa:
a+b=130
a:b=3 rest 10
a=3b+10
a I.........I............I.........I+10
b I.........I acolada 130
130-10=120(patru parti egale)
120:4=30(b)
30*3+10=90+10=100(a)
b=ax2
c=bx3
a+b+c=90
a. __
b. __ __
c. __ __ __ __ __ __
90:9=10; a
10x2=20; b
20x3=60;c
c=bx3
a+b+c=90
a. __
b. __ __
c. __ __ __ __ __ __
90:9=10; a
10x2=20; b
20x3=60;c