Bài 1 : tính a. ( -2 ) × 3 + ( -4 ) × 7 × 0 + 1 b. ( -1 ) × ( -2 ) + ( -3 ) × ( -4 ) – ( -2 ) × ( -3 ) c. ( -1 ) × ( -2 ) × ( -3) × ( -4 ) × ( -5 )

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1. Bài 1: 

   a, ( -2 ) × 3 + ( -4 ) × 7 × 0 + 1 

   = -6 + 0 + 1

   = -5

   b, ( -1 ) × ( -2 ) + ( -3 ) × ( -4 ) – ( -2 ) × ( -3 )

   = 2 + 12 – 6

   = 8

   c, ( -1 ) × ( -2 ) × ( -3) × ( -4 ) × ( -5 ) ÷ [ ( -3 ) – ( -5 )

   = 120  : -2

   = -60

   Chúc bạn học tốt!

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2. $a.(-2).3+(-4).7.0+1$

   $=-6+0+1$

   $=-5$

   $b.(-1).(-2)+(-3).(-4)-(-2).(-3)$

   $=2+12-6$

   $=8$

   $c.(-1).(-2).(-3).(-4).(-5):[(-3)-(-5)]$

   $=-120:2$

   $=-60$

   Xin hay nhất ạ.

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