a, 149-4.(x+25)=49
b, [ 2.(x+5)-31].4=52
a, 149-4.(x+25)=49 b, [ 2.(x+5)-31].4=52
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a, 149-4.(x+25)=49
b, [ 2.(x+5)-31].4=52
Gerda
Đáp án:
` 149 – 4(x+25) = 49`
` => -4(x+25) = 100`
` => x +25 = -25`
` => x = -25-25`
` => x = -50`
Vậy ` x = -50`
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` [ 2(x+5) – 31] . 4 = 52`
` => [2 (x+5) – 31] = 13`
` => 2(x+5) = 13 +31`
` => 2(x+5) = 44`
` => x +5 = 22`
` => x= 17`
Helga
Đáp án:
`149-4.(x+25)=49`
` 4.(x+25)=149-49`
`4.(x+25)=100`
` x+25=100:4`
`x+25=25`
` x=25-25`
`x=0`
`[ 2.(x+5)-31].4=52`
`[2.(x+5)-31]=52:4`
`[2.(x+5)-31]=13`
`2.(x+5)=13+31`
`2.(x+5)=44`
`(x+5)=44:2`
`(x+5)=22`
`x+5=22-5`
`x=17`