39+(-32)x(-22)x25
giúp nha
tính nha : 21 x 22 + 32 x 78 + 32 =
21x22 +32x78+32
=462 + 2496 +32
=2990
Tính nhanh
32 x (-39) + 16 x ( -22)
34 x (-84) + 17 (-32)
Help me!!!!!!!! T _ T
=16x2x(-39) + 16x(-22)
= 16 x (-78) + 16 x (-22)
= 16 x ( -78 + (-22)
= 16 x (-100)
= -1600
\(17\times2\times\left(-84\right)+17\times\left(-22\right)\)
\(17\times\left(-168\right)+17\times\left(-22\right)\)
\(17\times\left(-168+\left(-22\right)\right)\)
\(17\times\left(-190\right)\)
-3230
35.(14-23)-23.(14-35)
32.(-39)+16.(-22)
Giúp mk với
Cảm ơn nhiều nha!!!
cái này tính nhanh hay chỉ tính thui z bn
32.(-39)+16.(-22)
32.(-39 )+16.(-22 )
32.(-39)+16.(-22)
=32.(-39)+16.2.(-11)
=32.(-39)+32.(-11)
=32.(-39+-11)
=32.-50
=-1600
A 2+22+....+219+220
B 2+22+....+299+2100
C 3+32+.....+39+310
a: 2A=2^2+2^3+...+2^21
=>A=2^21-2
b: B=2+2^2+...+2^100
=>2B=2^2+2^3+...+2^101
=>B=2^101-2
c: C=3+3^2+...+3^10
=>3C=3^2+3^3+...+3^11
=>2C=3^11-3
=>C=(3^11-3)/2
`A = 2 + 2^2 + ... + 2^20`
`=> 2A = 2^2 + 2^3 + ... +2^21`
`=> 2A-A = (2^2 + 2^3 + ... + 2^21) - (2 + 2^2 + ... +2^20)`
`=> A = 2^21 - 2`
`B = 2 + 2^2 + ... + 2^99 + 2^100`
`=>2B = 2^2 + 2^3 + ... + 2^100 + 2^101`
`=> 2B-B = (2^2 + 2^3 + ... + 2^101)- (2 + 2^2 + ... + 2^100)`
`=> B = 2^101 - 2`
`C = 3 + 3^2 + .... + 3^10`
`=>3C = 3^2 + 3^3 + ... +3^11`
`=>3C - C = (3^2 + 3^3 + ... +3^11) - (3 + 3^2 + .... + 3^10)`
`=> 2C = 3^11 - 3`
`=> C = (3^11 - 3)/2
32.(-39)+16.(-22)
32.(-39)+16.(-22)
= 16.2.(-39)+16.(-22)
= 16.(-78)+16.(-22)
= 16.[(-78)+(-22)]
= 16.(-100)
= -1600
\(32.\left(-39\right)+16.\left(-22\right)=2.16.\left(-39\right)+16\left(-22\right)\)
\(=16.\left(-78\right)+16\left(-22\right)\)
\(=16.\left(-78-22\right)\)
\(=16.\left(-100\right)=-1600\)
32.(-39) + 16.(-22)
\(32.\left(-39\right)+16.\left(-22\right)=16\left(-39.2-22\right)=16.\left(-100\right)=-1600\)
32.(-39)+16.(-22)
Ta có: \(32.\left(-39\right)+16.\left(-22\right)\)
\(=16.2.\left(-39\right)+16.\left(-22\right)\)
\(=16.\left(-78\right)+16.\left(-22\right)\)
\(=16.\left[\left(-78\right)+\left(-22\right)\right]\)
\(=16.\left(-100\right)\)
\(=-1600\)
\(32.\left(-39\right)+16.\left(-22\right)\)
\(=\left(-1248\right)+\left(-352\right)\)
\(=\left(-1600\right)\)