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[(321 - 797) + (-321 + 697)] - 371 - [1900 + (-371)]
= [321 - 797 - 321 + 697] - 371 - 1900 + 371
= [321 - 321 - 797 + 697] - 371 + 371 - 1900
= -100 - 1900
= -2000.
Học tốt.
\(\left[\left(321-797\right)+\left(-321+697\right)\right]-371-\left[1900+\left(-371\right)\right]\)
\(=321-797-321+697-371-1900-371\)
\(=\left(321-321\right)-\left(797-697\right)-\left(371-371\right)-1900\)
\(=0-100-0-1900\)
\(=-100-1900\)
\(=-2000\)
321 + { -15 + [ 30 + (-321) ] }
= 321 + { -15 + [ 30 - 321 ] }
= 321 + { -15 + 30 - 321 }
= 321 - 15 + 30 - 321
= (321 - 321) - (15 - 30)
= 0 - (-15)
= 15
(2016 + 432) + [168 + (-2016) ]
= 2016 + 432 + [ 168 - 2016 ]
= 2016 + 432 + 168 - 2016
= (2016 - 2016) + (432 + 168)
= 0 + 600
= 600
minh khong biet dau minh chi moi lop 5 thoi
chuc ban nam moi vui ve
thank you very much
a) 93. 85+ 17. 45-170 = 93. 17. 5+ 17.9.5-17.5.2= 17.5.( 93+ 9-2)= 85. 100 = 8500
b) \(\left(\frac{-13}{31}:\frac{5}{17}+\frac{-18}{31}:\frac{5}{17}\right).\frac{25}{34}\)
\(=\left(\frac{-13}{31}.\frac{17}{5}+\frac{-18}{31}.\frac{17}{5}\right).\frac{25}{34}\)
\(=\left(\frac{-13}{31}+\frac{-18}{31}\right).\frac{17}{5}.\frac{25}{34}\)
\(=\left(-1\right).\frac{5}{2}\)
\(=\frac{-5}{2}\)
CHÚC BN HỌC TỐT!!
a, 98.85 + 17.45 - 170 = 116.3 - 170 = -53.7
b, (-13/31 : 5/17 + -18/31 : 5/17) x 25/34 = 17/5 x ( -13/31 + -18/31) x 25/34
=17/5 x -1 x 25/34 = -5/2 = -2.5
a) \(\frac{158\cdot168-168\cdot58}{110}\)
\(=\frac{\left(158-58\right)\cdot168}{110}\)
\(=\frac{100\cdot168}{110}=\frac{16800}{110}=\frac{1680}{11}\)
b) \(\frac{\left(456.11+912\right)\cdot37}{13\cdot74}\)
\(=\frac{456\cdot11+456\cdot2\cdot37}{13\cdot37\cdot2}\)
\(=\frac{456\cdot\left(11+2\right)\cdot37}{\left(13\cdot2\right)\cdot37}\)
\(=\frac{456\cdot13\cdot37}{26\cdot37}=228\)
c) \(\frac{864\cdot48-432\cdot96}{864\cdot48\cdot432}\)
\(=\frac{432\cdot2\cdot48-432\cdot48\cdot2}{432\cdot2\cdot48\cdot432}=0\)
\(\text{14-(-15)-21}\)
\(=14+15-21\)
\(=29-21\)
\(=8\)
\(321+\left\{-15+\left[30+\left(-321\right)\right]\right\}\)
\(=321+\left(-15\right)+30+\left(-321\right)\)
\(=\left(321+\left(-321\right)\right)+\left(\left(-15\right)+30\right)\)
\(=0+15\)
\(=15\)
\(\text{(2016+432)+[168+(-2016)]}\)
\(=2016+432+168+\left(-2016\right)\)
\(=\left[2016+\left(-2016\right)\right]+\left(432+168\right)\)
\(=0+600\)
\(=600\)
học tốt
172 - ( 36+172)
=172 - 36 -172
= ( 172-172)-36
=-36
( 170+25)-170
= 170 + 25 -170
= ( 170-170)+25
= 25