\(a.=\left(4345+3845\right):126\\ =8190:126=65\\ b.=\left(24563-12215\right):126\\ =12348:126=98\)

\(a,4345:126+3845:126=\left(4345+3845\right):126=8190:126=65\\ b,24563:126-12215:126=\left(24563-12215\right):126=12348:126=98\)

  132:0,125+132:0,25-132:0,2+132:0,5+132

=  132*8+132*4-132*5+132*2+132*1

=  132*(8+4-5+2+1)

=  132*10

=  1320

kb với mình nhé!

132 : 0,125 + 132 : 0,25 -132 : 0,2 + 132 : 0,5 +

=132 : 0,125 + 132 : 0,25 -132 : 0,2 + 132 : 0,5 + 132 . 1

=132(0,125+0,25-0,2+0,5+1)

=132.1,675

=221,1

\(248\times2005-2005\times248\)

\(=248\times\left(2005-2005\right)\)

\(=248\times0\)

\(=0\)

248*2005-248*2005=248(2005-2005)=248*0=0

\(248\times2006-2006-2006\times148=2006\times\left(248-1-148\right)=2006\times99=198594\)

Cảm ơn nhiều!!!!

124 x 36 + 248 x 72

= 124 x 36 + 248 x 2 x 36

= 124 x 36 + 496 x 36

= (124 + 496) x 36

= 620 x 36 = 22320

123*54+132*45+132=123*54+(45+1)*132

=123*54+46*132

=123*54+46*(123+9)

=123*54+46*123+46*9

=123*(54+46)+414

=123*10+414

=1230+414

=1644

126 : 3 + 231 : 3 + 543 : 3

= ( 126 + 231 + 543 ) : 3

= 900 : 3

= 300

126 : 3 + 231 : 3 + 543 : 3

= \(126.\frac{1}{3}+231.\frac{1}{3}+543.\frac{1}{3}\)

=\(\frac{1}{3}\left(126+231+543\right)=\frac{1}{3}.900=300\)

\(123+132+213+312+321\)

\(=\left(123+312\right)+\left(213+132\right)+321\)

\(=435+345+321\)

\(=\left(435+345\right)+321\)

\(=780+321=1101\)

123+132+213+231+312+321

=(123+321)+(213+132)+321

=435+345+321

=(435+345)+321

=780+321

=1101