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a)187 + [923 - (923 + 887)]
= 187 + [923 - 923 - 887]
= 187 + 923 - 923 - 887
= 187 + 0 - 887
= 187 - 887
= -700
b)39 . 187 + 302 - 78 . 39
= 39 . 187 + 900 - 78 . 39
= 39 . (187 - 78) + 900
= 39 . 109 + 900
= 4251 + 900
= 5151
a, 187+[923-(923+887)]
=187+[923-923-887]
=187-887
=-700
b, 39.187+302-78.39
=39.(187-78)+900
=39.109+900
=4251+900
=5151
Câu b bạn xem lại đầu bài là 78 hay 87 nha. Là 87 sẽ đúng hơn đó.
Thực hiện các phép tính sau:
a. (-9989)-(2008-9989)+(-192)
b. 44.179+202-79.44
c. 3.42:|500-(7.35+125)|
a, (-27) + |(-127)| - 100
= (-27) + 127 - 100
= [(-27) + 127] - 100
= 100 - 100
= 0
Phần b và c làm tương tự.
a) \(9\cdot2^3-72:2^2\)
\(=72-18=54\)
b) \(125\cdot26+5^3\cdot32+25\cdot42\cdot5\)
\(=125\cdot26+125\cdot32+125\cdot42\)
\(=125\cdot\left(26+32+42\right)=125\cdot100=12500\)
c) \(5871:\left[928-\left(247-82\right)\cdot5\right]+2012^0\)
\(=5871:\left[928-\left(247-82\right)\cdot5\right]+1\)
\(=5871:\left(928-165\cdot5\right)+1\)
\(=5871:103+1\)
\(=58\)
d) \(2012+78+\left(-178\right)+\left(-2012\right)\)
\(=\left[2012+\left(-2012\right)\right]+\left[78+\left(-178\right)\right]\)
\(=-100\)
a, \(9.2^3-\frac{72}{2^2}=9.8-\frac{72}{4}=72-18=54\)
b, \(125.26+5^3.32+25.42.5\)
\(=125.26+125.32+125.42\)
\(=125.\left(26+32+42\right)\)
\(=125.100\)
\(=12500\)
c, \(\frac{5871}{\left[928-\left(247-82\right).5\right]}+2012^0\)
\(=\frac{5871}{103}+1\)
\(=57+1\)
\(=58\)
d, \(2012+78+\left(-178\right)+\left(-2012\right)\)
\(=\left[2012+\left(-2012\right)\right]+\left[78+\left(-178\right)\right]\)
\(=0+100\)
\(=100\)
Câu 2:
a: \(=9\cdot8-72:4=72-18=54\)
b: \(=125\cdot26+125\cdot32+125\cdot42\)
\(=125\left(26+32+42\right)=125\cdot100=12500\)
c: \(=5871:\left(928-825\right)+1=5871:103+1=57+1=58\)
d: \(=2012+78-178-2012=-100\)
-(127+38-21)-(121-27+48)+50
=-127-38+21-121+27-48+50
=(-127+27)-(38+48)+(21-121)+50
=-100-86-100+50
=-(100+100+86)+50
=-286+50
=-236
-39+(193-127+96)-(193+196-127)
=-39+193-127+96-193-196+127
=-39+(193-193)-(127+127)+(96-196)
=-39-100
=-139
\(a/(-8978)-\left(2007-8978\right)+\left(-193\right)\)
\(=\left(-8978\right)-\left(-6971\right)+\left(-193\right)\)
\(=\left(-8978\right)+6971+\left(-193\right)\)
\(=-2007+\left(-193\right)\)
\(=-2200\)
\(b/187+\left[923-\left(923+887\right)\right]\)
\(=187+\left[923-1810\right]\)
\(=187+\left(-887\right)\)
\(=-700\)
\(c/39.178+30^2-78.39\)
\(=39.\left(178-78\right)+900\)
\(=39.100+900\)
\(=3900+900\)
\(=4800\)
\(d/3.4^2:\left[500-\left(7.35+125\right)\right]\)
\(=3.16:\left[500-\left(245+125\right)\right]\)
\(=48:\left(500-370\right)\)
\(=48:130\)
\(=\frac{24}{35}\)