Toán Lớp 6: Tính hợp lí nhất:
– ( 52 – 16 – 34 ) + ( 52 – 34 )
– 2003 + ( – 21 + 75 + 2003 ) – ( – 21 – 25 + 239 )
Toán Lớp 6: Tính hợp lí nhất:
– ( 52 – 16 – 34 ) + ( 52 – 34 )
– 2003 + ( – 21 + 75 + 2003 ) – ( – 21 – 25 + 239 )
=-52+16+34+52-34
=(-52+52)+(-34+34)+16=16
_____________
-2003-21+75+2003+21+25-239
=100-239=-139
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