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a) \(-\left(76-35+15\right)+\left[18-27+\left(-17\right)\right]\)
\(=-76+35+15+18-27-17\)
\(=-52\)
b) \(167+\left[127-235-\left(-16\right)\right]+\left(-67\right)\)
\(=167+127-235+16-67\)
\(=8\)
c) \(\left(-19\right)+165-\left[27+\left(-21\right)-\left(+72\right)\right]\)
\(=\left(-19\right)+165-27+21+72\)
\(=212\)
d) \(89.\left(-2\right)+\left[20+\left(-2\right).\left(-5\right)-85\right]\)
\(=\left(-178\right)+\left(20+10-85\right)\)
\(=\left(-178\right)+20+10-85\)
\(=-233\)
\(\left(-12\right)+\left(-13\right)+36+\left(-11\right)=\left(-12-13-11\right)+36\)
\(=\left(-36\right)+36\)
\(=0\)
a.17⋅(29−(−111)]+29⋅(−17)17⋅(29−(−111))+29⋅(−17)
=17⋅(29+111)−29⋅17=17⋅(29+111)−29⋅17
=17⋅(29+111−29)=17⋅(29+111−29)
=17⋅(29−29+111)=17⋅(29−29+111)
=17⋅111=17⋅111
=2997=2997
b.19⋅43+(−20)⋅43−(−40)19⋅43+(−20)⋅43−(−40)
=19⋅43−20⋅43+40=19⋅43−20⋅43+40
=43(19−20)+40=43(19−20)+40
=43⋅(−1)+40=43⋅(−1)+40
=−43+40=−43+40
=−3=−3
[ chúc bạn học tốt ]
1) 37,5.6,5-7,5.3,4-6,6.7,5+3,5.37,5
=(37,5.6,5+3,5.37,5) - (7,5.3,4+6,6.7,5)
=37,5.(6,5+3,5) - 7,5.(3,4+6,6)
=37,5.10-7,5.10
=10.(37,5-7,5)
=10.30
=300
2)-39.121+125+39.21
=-39.21-39.100+125+39.21
=(-39.21+39.21)+(125-39.100)
=0+125-3900
=-3775
3)35.17 - 65.34
=35.17-65.2.17
=35.17-130.17
=17.(35-130)
=17.(-95)
=-1615
17[21-(-111)]+17[29-121]=17.132+17.(-92)=17.[132+(-92)]=17.40=680