Question

va rog ajutor ex 52 .......57

Answer 1

3090-2524=556(prima scoala)
2524-556=1968(a doua scoala)
3580-(556+1968)=3580-2524=1056
(problema 52)


Problema 53
10.000-(2568+2794)=10.000-5363=4637


Problema 54
L•2+l•2=87•2+45•2=174+90=264


Problema 55
34•2=64(Lungime)
34•2+64•2=68+128=196


Problema 56
69:3=23
69•2+23•2=138+46=184

Problema 57
36:4=9

Answer 2

57. 36:4=9

52. a+b+c=3580   a- prima scoala b- a doua scoala c- a treia scoala

a+b=2524

a+c=3090

inlocuiesti

2524+c=3580

c=3580-2524

c=1056 (a treia scoala)

inlocuiesti iar

3090+b=3580

b=3580-3090

b=490 ( a 2 scoala)

acum faci b+c (scolile care le cunosti)

490+1056=1546

a+1546=3580

a=3580-1546

a=2034