Toán Lớp 6: ( 42 – 34 + 17 ) – ( 42 – 17 )
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Toán Lớp 6: ( 42 – 34 + 17 ) – ( 42 – 17 )
Giúp mình vớiiii plssssss
Comments ( 2 )
( 42 – 34 + 17 ) – ( 42 – 17 )
= 42 – 34 + 17 – 42 + 17
= ( 42 – 42 ) – 34 + ( 17 + 17 )
= 0 – 34 + 34
= -34 + 34
= 0
(42-34+17)-(42-17)
=42-34+17-42+17
=(42-42)+[(-34)+17]+17
=0+(-17)+17
=(-17)+17
=0