Đáp án:
Giải thích các bước giải:
`text{C1:}`
`1/` `35 . 18 - 5 . 7 .28`
` 35 . 18 - 5 . 7 .28`
`=35.18-35.28`
`=35.(18-28)` `=-350`
`2/` `45-5.(12+9)`
`45-5.(12+9)`
`=45-5.9+5.12`
`=45-60-45`
`=-60`
`3/` `24 . ( 16 - 5 ) - 16 . (24 - 5 )`
`24 . ( 16 - 5 ) - 16 . (24 - 5 )`
`=24.16-24.5-16.24-16.5`
`=-[5.(24+16]`
`=-200`
`4/` `29 . (19 - 13 ) - 19 . (29 - 13 )`
`29 . (19 - 13 ) - 19 . (29 - 13 )`
`=29.19-29.13-19.29-19.13`
`=[13.(29-19)]`
`=-130`
`5/` `31 . ( -18 ) + 31 . ( -81) - 31`
`=31.(-18)+31.(-81)-31.1`
`=31.[(-18)-(-81)-1]`
`=31.62`
`=1922`
`6/` `( - 12 ) . 47 + ( -12) . 52 + (-12)`
`=( - 12 ) . 47 + ( -12) . 52 + (-12).1`
`=(-12).(47+52+1)`
`=(-12).100`
`=-1200`
`7/` `13 . ( 23 + 22 ) - 3 . (17 + 28 )`
`=13.45-3.45`
`=(13-3).45`
`=10.45`
`=450`
`8/` `-48 + 48 . ( -78 ) = 48 . (-21)`
`=48.[(-1)+(-78)+(-21)]`
`=48.(-100)`
`=-4800`