\(a)\) \(4.126.25=\left(4.25\right).126=100.126=12600\)
2 bạn biết các câu còn lại ko giúp mik nhé
cả 2 bn đều đúng .Miyuki Misaki trình bày đẹp hơn
\(\left(9.8-12-5.12\right)\left(15\right)\)
\(\left(9.8-12\left(1+5\right)\right)\left(15\right)\)
\(\left(9.8-12.6\right)\left(15\right)\)
\(\left(6.8+3.8-12.6\right)\left(15\right)\)
\(3\left(2.8+8-4.2\right)\left(15\right)=3\left(16\right)\left(15\right)=48\left(15\right)\)
\(=48.10+48.5=480+40.5+8.5=480+200+40=680+40=720\)
d, \(2006.\left(43.10-2.43.5\right)+100\)
\(2006\left\{43\left(10-2.5\right)\right\}+100=2006\left(0\right)+100=100\)
a)4*126*25
=(25*4)*126
=100*126
=12600
c)3*9+18*2+2*9+9*1
=3*9+9*2*2+9*1
=9*(3+2+2+1)
=9*8
=72
a) 4 x 126 x 25
= 4 x 25 x 126
= 100 x 126
= 12600
b) [9 x 8 - 12 - 5 x 12] x [1 + 2 + 3 + 4 + 5]
= [(9 x 8) - 12 - (5 x 12)] x [(1 + 4) + (3 + 2) + 5]
= [72 - 12 - 60 ] x [5 + 5 + 5]
= 0 x 15
= 0
c) 3 x 9 + 18 x 2 + 2 x 9 + 9
= (3 x 9) + (18 x 2) + (2 x 9) + 9
= 27 + 36 + 18 + 9
= 90
d) 2006 x [43 x 10 - 2 x 43 x 5] + 100
= 2006 x [430 - 430] + 100
= 2006 x 0 + 100
= 100
b, \(\left(9.8-12-5.12\right)\left(15\right)=\left(12.8-3.8-12-5.12\right)\left(15\right).\)
\(\left\{12\left(8-1-5\right)-24\right\}\left(15\right)=\left(24-24\right)\left(15\right)=0\)
c) \(3.9+9.2+9.2+2.9+9=9\left(3+2+2+2+1\right)=9\left(10\right)=90\)
d)\(2006\left(43.10-2.43.5\right)+100=2006\left(43\left(10-2.5\right)\right)+100=100\)
tích cho chúa pAIN
a)4x126x25
=(4x25)x126
=100x126
=12600
b)[9x8-12-5x12]x[1+2+3+4+5]
=[3x3x8-3x4-3x4x5]x15
=3x[24-4-20]x15
=3x0x15
=0
c)3x9+18x2+2x9+9
=3x9+9x2x2+2x9+9x1
=9x(3+2x2+2+1)
=9x(3+4+2+1)
=9x10
=90
d)2006x[43x10-2x43x5]+100
=2006x[43x(10-2x5)]+100
=2006x[43x0]+100
=2006x0+100
=0+100
=100
