Toán Lớp 6: Tính hợp lý:
21+22+23+24+25-26-27-28-29
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Toán Lớp 6: Tính hợp lý:
21+22+23+24+25-26-27-28-29
Comments ( 2 )
= (21- 26)+ (22- 27)+ (23- 28)+ (24- 29)+ 25
= (-5)+ (-5)+ (-5)+ (-5)+ 25
= (-5)xx4+ 25
= 5