siêng zữ zj e ngủ sớm ik:>
1.
\(=199-63-99-37\)
\(=199-99-63-37=100-100=0\)
1)
199 + ( - 63) - 99 + ( -37)
= 199 - 63 - 99 - 37
= 199 - 99 - 63 - 37
= 100 - 100
=0
`1)199+(-63)-99+(-37)`
`=(199-99)+[(-63)+(-37)]`
`=100+(-100)=0`
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`2)34+(-120)+66+(-80)`
`=(34+66)+[(-120)+(-80)]`
`=100+(-200)=-100`
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`3)(-143)+75+(-57)-175`
`=[(-143)+(-57)]+(75-175)`
`=(-200)+(-100)=-300`
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`4)74-198+(-174)-2`
`=[74+(-174)]-(198+2)`
`=(-100)-200=-300`
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`5)159+(-38)-259-62`
`=(159-259)+[(-38)-62]`
`=(-100)+(-100)=-200`
2)
34 + (- 120) + 66 + (-80)
= 34 - 120 + 66 - 80
= 34 + 99 - 120 - 80
= 133 - 40
= 93
1)
199 + ( - 63) - 99 + ( -37)
= 199 - 63 - 99 - 37
= 199 - 99 - 63 - 37
= 100 - 100
=0
