Toán Lớp 6: Tính nhanh:
40 + ( 139 – 172 + 99 ) – ( 139 + 199 – 127)
giúp mình với gấp nhé
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Toán Lớp 6: Tính nhanh:
40 + ( 139 – 172 + 99 ) – ( 139 + 199 – 127)
giúp mình với gấp nhé
Comments ( 2 )
Giải đáp:
40 + ( 139 – 172 + 99 ) – ( 139 + 199 – 127 )
= 40 + 139 – 172 + 99 – 139 – 199 + 127
= 40 + ( 139 – 139 ) + ( 99 – 199) + ( -172 + 127)
= 40 + 0 – 100 – 45
= -5 – 100
= -105
40 + ( 139 – 172 + 99 ) – ( 139 + 199 – 127 )
= 40 + 139 – 172 + 99 – 139 – 199 + 127
= 40 + ( 139 – 139 ) + ( – 172 + 127 ) + ( 99 – 199 )
= 40 – 45 – 100
= – 5 – 100
= – 105