Toán Lớp 6: Tính bằng cách thuận tiện :
C = [ 3 . ( -2 ) – ( -8 ) ] . ( -7 ) – ( -2 ) . ( -5 )
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Toán Lớp 6: Tính bằng cách thuận tiện :
C = [ 3 . ( -2 ) – ( -8 ) ] . ( -7 ) – ( -2 ) . ( -5 )
Comments ( 2 )
C = [ 3 . ( -2 ) – ( -8 ) ] . ( -7 ) – ( -2 ) . ( -5 )
=(-6+8).(-7)+2.(-5)
=2.(-7)+2.(-5)
=2.[(-7)+(-5)]
=2.(-7-5)
=2.(-12)
=-24
C = [ 3 . ( -2 ) – ( -8 ) ] . ( -7 ) – ( -2 ) . ( -5 )
C = [(-6) + 8] . (-7) + 2 . (-5)
C = 2 . (-7) + 2 . (-5)
C = 2 . [(-7)+(-5)]
C = 2. (-12)=-24