Bài 1 : Tính
a. ( -2 ) × 3 + ( -4 ) × 7 × 0 + 1
b. ( -1 ) × ( -2 ) × ( – 3 ) × ( – 4 ) × ( -5 ) ÷ [( -3 ) – ( – 5 ) ]
c. ( – 1 ) × ( – 2 ) + ( -3 ) × ( -4 ) – ( -2 ) × ( – 3 )
Bài 1 : Tính
a. ( -2 ) × 3 + ( -4 ) × 7 × 0 + 1
b. ( -1 ) × ( -2 ) × ( – 3 ) × ( – 4 ) × ( -5 ) ÷ [( -3 ) – ( – 5 ) ]
c. ( – 1 ) × ( – 2 ) + ( -3 ) × ( -4 ) – ( -2 ) × ( – 3 )
Đáp ánGiải thích các bước giải:
`a. ( -2 ) × 3 + ( -4 ) × 7 × 0 + 1`
`=-6+0+1`
`=-5`
`b. ( -1 ) × ( -2 ) × ( – 3 ) × ( – 4 ) × ( -5 ) ÷ [( -3 ) – ( – 5 ) ]`
`=(2 xx 12 xx (-5)) \div 2`
`=-60`
`c. ( – 1 ) × ( – 2 ) + ( -3 ) × ( -4 ) – ( -2 ) × ( – 3 )`
`=2+12-6`
`=2+6`
`=8`
Đáp án:+Giải thích các bước giải:
`a. ( -2 ) × 3 + ( -4 ) × 7 × 0 + 1 `
`=-6+0+1`
`=-6+1`
`=-(6-1)`
`=-5`
`b. ( -1 ) × ( -2 ) × ( – 3 ) × ( – 4 ) × ( -5 ) : [( -3 ) – ( – 5 ) ] `
`=2xx(-3)xx(-4)xx(-5):2`
`=-6xx20:2`
`=-120:2`
`=-60`
`c. ( – 1 ) × ( – 2 ) + ( -3 ) × ( -4 ) – ( -2 ) × ( – 3 )`
`=2+12-6`
`=14-6`
`=8`