Toán Lớp 6: Tìm x biết : 89 + (138

Lời giải: 89+(138-x)=90 ⇒89+138-x=90 ⇒227-x=90 ⇒x=227-90 ⇒x=137 Vậy x=137

$@Shinn$ 89+(138-x)=90 (138-x)=90-89 138-x=1 x=138-1 x=137 ⇒ Vậy x=137

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Toán Lớp 6: Tìm x biết : 89 + (138 – x) = 90