Question

Afla nr necunoscut b:5=139 rest2; 593:c=9rest8 ;a·7<35 și m:8<4 ;[(a:9)·7+(102:2)]-49=58, ;8·a+573:3-93=210

Answer 1

b÷5=139 rest 2
b=139×5+2
b=695+2
b=697
v:697÷5=139 rest 2

593÷c=9 rest 8
c=(593-8)÷9
c=585÷9
c=65
v:593÷65=9 rest 8

a×7<35
a=0,1,2,3,4
v:0×7<35 0<35 (convine)
1×7<35 7<35 (convine)
2×7<35 14<35 (convine)
3×7<35 21<35(convine)
4×7<35 28<35 (convine)

m÷8<4
m=8,16,24
v:8÷8<4 1<4(convine)
16÷8<4 2<4(convine)
24÷8<4 3<4(convine)

[(a÷9)×7+(102÷2)]-49=58
[(a÷9)×7+51]-49=58
(a÷9)×7+51=58+49
(a÷9)×7+51=107
(a÷9)×7=107-51
(a÷9)×7=56
a÷9=56÷7
a÷9=8
a=8×9
a=72
v:[(72÷9)×7+(102÷2)]-49=58
(8×7+51)-49=58
(56+51)-49=58
107-49=58

8×a+573÷3-93=210
8×a+191-93=210
8×a+191=210+93
8×a+191=303
8×a=303-191
8×a=112
a=112÷8
a=14
v:8×14+573÷3-93=210
112+191-93=210
303-93=210

Sper că te-am ajutat.