Question

658:7+3-{2+[202-3(206:2-2a)-1]:4}=47

Answer 1

Răspuns

Explicație pas cu pas:

Răspuns

Explicație pas cu pas:

658 : 7 + 3 - { 2 + [ 202 - 3 × (206 : 2 - 2 × a) - 1 ] : 4 } = 47

94 + 3 - { 2 + [ 202 - 3 × ( 103 - 2 × a ) - 1 ] : 4 } = 47

97 - { 2 + [ 202 - 3 × ( 103 - 2 × a ) - 1 ] : 4 } = 47

2 + [ 202 - 3 × ( 103 - 2 × a ) - 1 ] : 4 = 97 - 47

2 + [ 202 - 3 × ( 103 - 2 × a ) - 1 ] : 4 = 50

[ 202 - 3 × ( 103 - 2 × a ) - 1 ] : 4 = 50 - 2

[ 202 - 3 × ( 103 - 2 × a ) - 1 ] : 4 = 48

202 - 3 × ( 103 - 2 × a ) - 1 = 48 × 4

202 - 3 × ( 103 - 2 × a ) - 1 = 192

202 - 3 × ( 103 - 2 × a )  = 192 + 1

3 × ( 103 - 2 × a ) = 202 - 193

3 × ( 103 - 2 × a ) = 9

103 - 2 × a = 9 : 3

2 × a = 103 - 3

2 × a = 100

a = 100 : 2

a = 50 → numarul, aflat prin metoda mersului invers

Answer 2

94+3-{2+[202-3(103-2a)-1]:4}=47
94+3-[2+(202-309+6a-1):4]=47
94+3-[2+(-108+6a):4]=47
94+3-(2+ -108+6a / 4)=47
94+3-2 -108+6a / 4=47
95- 2(-54+3a) / 4=47
95 -54+3a / 2=47
190-(-54+3a)=94
190-54-3a=94
244-3a=94
-3a=94-244
-3a=-150
a=50.