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TÍNH NHANH
1) 24.( 16-5) -16.(24-5)
2)31.(-18)+31.(-18)-31
3) 13.(23+22) - 3.(17+28)
4) 19.25+9.95+19.30
35.18-5.7.28
=35.18-35.28
=35.(18-28)
=35.(-10) =-350
1) \(35.18-5.7.28=35.18-35.28=35\left(18-28\right)=-350\)
2) \(45-5\left(12+9\right)=45-60-45=-60\)
3) \(24\left(16-5\right)-16\left(24-5\right)=24.16-24.5-16.24+16.5=5\left(16-24\right)=5.8=40\)
4) \(29\left(19-13\right)-19\left(29-13\right)=29.19-29.13-19.29+19.13=13\left(19-29\right)=-130\)
5) \(31.\left(-18\right)+31.\left(-81\right)-31=-31.\left(18+81+1\right)=-3100\)
6) \(\left(-12\right).47+\left(-12\right).52+\left(-12\right)=\left(-12\right)\left(47+52+1\right)=-1200\)
7) \(13\left(23+22\right)-3\left(17+28\right)=13.45-3.45=45.\left(13-3\right)=450\)
8) \(-48+48.\left(-78\right)+48.\left(-21\right)=-48\left(1+78+21\right)=-4800\)
Tải PHOTOMATH bạn nhé
a) 24.(16-5)+16.(24-5)
=24.16-24.5+16.24-16.5
=32.24-40.5
=...................
31.(-81)+31.(-81)-31
=31[(-81)-81-1]
=31.(-163)
=...........................
13(23+22)-3(17+28)
=13.23+13.22-3.17-3.18
=...................................
a) \(24.\left(16-5\right)+16.\left(24-5\right)\)
\(=24.16-24.5+16.24-16.5\)
\(=24\left(16+16\right)+5\left(-24-16\right)\)
\(=24.32+5.\left(-40\right)\)
\(=768+\left(-200\right)\)
\(=568\)
b) \(31.\left(-18\right)+31.\left(-81\right)-31\)
\(=31.\left[\left(-18\right)+\left(-81\right)-1\right]\)
\(=31.\left(-100\right)\)
\(=-3100\)
c) \(13.\left(23+22\right)-3.\left(17+28\right)\)
\(=13.45-3.45\)
\(=45.\left(13-3\right)\)
\(=45.10\)
\(=450\)