Toán Lớp 6: a) ( 93 + 21 – 1 ) – ( 21 – 7 + 24 )
b) (-123) + 77 + (-157) + 23
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Toán Lớp 6: a) ( 93 + 21 – 1 ) – ( 21 – 7 + 24 )
b) (-123) + 77 + (-157) + 23
Cần gấp, xin giúp ạ
Comments ( 2 )
=93+21-1-21+7-24
=93-1+7-24
=75
=-(123+157)+(77+23)
=-280+100
=-180