Toán Lớp 6: 21 + (-21 + x) = 252 – (25 + 252)
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Toán Lớp 6: 21 + (-21 + x) = 252 – (25 + 252)
Comments ( 2 )
=>21+(-21)+x=252-25-252
=>[21+(-21)]+x=(252-252)-25
=>0+x=0-25
=>x=-25
Vậy x=-25