Toán Lớp 6: bài 1 : tính
( 14 – 12 – 7 ) – [- ( – 3 + 2 ) + ( 5 – 9 ) ]
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Toán Lớp 6: bài 1 : tính
( 14 – 12 – 7 ) – [- ( – 3 + 2 ) + ( 5 – 9 ) ]
Comments ( 2 )
( 14 – 12 – 7) – [ – ( -3 + 2) + ( 5 – 9)]
= ( 14 – 12 – 7) – ( 3 – 2+ 5- 9)
= 14 – 12 – 7 – 3 + 2 – 5 + 9
= 14 – ( 12 – 2) – ( 7 + 3) – 5 + 9
= 14 – 10 – 10 – 5 + 9
= 14 – ( 10 + 10) – ( 5 – 9)
= 14 – 20 – (-4)
= 14 – 20 + 4
= -6 + 4
= -2
@caty09
Giải đáp:
Lời giải và giải thích chi tiết:
( 14 – 12 – 7 ) – [- ( – 3 + 2 ) + ( 5 – 9 ) ]
= 14 – 12 – 7 – [3 – 2 + 5 – 9)
= 14 – 12 – 7 – 3 + 2 – 5 + 9
= -2