Tính nhanh, tính hợp lý nếu có thể
b) 125. (-61).(-2)^3. (-1)^2018
g) (-195).56 – 43.195 – 195
h) 32.(132 – 247) – 132.(32-247)
i) 135. (-12 + 145) – 145.(135-12)
Cảm ơn mn đã giúp.
Tính nhanh, tính hợp lý nếu có thể b) 125. (-61).(-2)^3. (-1)^2018 g) (-195).56 – 43.195 – 195 h) 32.(132 – 247) – 132.(32-247) i) 135. (-12 + 145) –
By Maria
b, 125 . ( -61 ) . `(-2)^3` . `(-1)^2018`
= 125 . ( -61 ) . ( -8 ) . 1
= 125 . 8 . 61
= 1000 . 61
= 61000
g, ( -195 ) . 56 – 43 . 195 – 195
= 195 . ( -56 ) – 43 . 195 – 195
= 195 . ( -56 – 43 – 1 )
= 195 . ( -100 )
= -19500
h, 31 . ( 132 – 247 ) – 132 . ( 32 – 247 )
= 31 . 132 – 31 . 247 – 132 . 32 + 132 . 247
= 132 . 247 – 31 . 247
= ( 132 – 31 ) . 247
= 101 . 247
= 24947
i, 135 . ( -12 + 145 ) – 145 . ( 135 – 12 )
= 135 . ( -12 ) + 135 . 145 – 145 . 135 + 145 . 12
= 145 . 12 – 135 . 12
= ( 145 – 135 ) . 12
= 10 . 12
= 120
`125. (-61).(-2)^3. (-1)^2018`
`= 125 . ( -61 ) . ( -8 ) . 1`
` = 1000 . 61`
` = 61000`
`g, ( -195 ) . 56 – 43 . 195 – 195`
`= 195 . ( -56 – 43 – 1 )`
`= 195 . ( -100 )`
`= -19500`
`h, 31 . ( 132 – 247 ) – 132 . ( 32 – 247 )`
`= 31 . 132 – 31 . 247 – 132 . 32 + 132 . 247`
` = 132 . 247 – 31 . 247`
` = ( 132 – 31 ) . 247`
` = 101 . 247 `
`= 24947`
`i, 135 . ( -12 + 145 ) – 145 . ( 135 – 12 )`
`= 135 . ( -12 ) + 135 . 145 – 145 . 135 + 145 . 12`
`= 145 . 12 – 135 . 12`
`= ( 145 – 135 ) . 12`
` = 10 . 12`
`= 120`