2,022 *1234 + 1,001 *266 *2 + 3*500*0,674 =2,022 *1234 + 1,001 *2*266+3*0,674*500=2,022*2000=4044

\(101\times2,022-2,022\\ =\left(101-1\right)\times2,022\\ =100\times2,022\\ =202,2\)

\(101\times2,022-2,022\)

\(=2,022\)\(\times\left(101-1\right)\)

\(=2,022\times100\)

\(=202,2\)

1234 x 5678 x ( 630 - 315 x 2) : 1996 

= 1234 x 5678 x (630 -630 ) : 1996 

= 1234 x5678 x 0 : 1996

= 0

o

hok tốt

a) 19,17x25x4=19,17(25x4)=19,17x100=1917

b)1,79x(8x125)=1,79x1000=1790

chúc bạn học tốt

= 3,5 x 3 x 8 x 1,25 

= 3,5 x 3 x 10

= 3,5 x 10 x 3

= 35 x 3

= 75

\(=13,25\times(5+2+3)\)

\(=13,25\times10=132,5\)

e: \(\left(1+2+4+\cdots+512\right)\times\left(101\times102-101\times101-50-51\right)\)

\(=\left(1+2+4+\cdots+512\right)\times\left(101\times102-101\times101-101\right)\)

\(=\left(1+2+4+\cdots+512\right)\times101\times\left(102-101-1\right)\)

=0

d: 1996x1995-996-1000-1996x1994

=1996x(1995-1994)-1996

=1996x1-1996

=1996-1996

=0

c: 399x46+65x399-10x399-10x399

=399x(46+65-10-10)

=399x91

=36309

b: 1234x5678x(630-315x2):1996

=1234x5678x(630-630):1996

=0

\(5,4\times36,8+1,8\times52,2\times3+0,01\times11\times540\)

\(=5,4\times36,8+5,4\times52,2+\left(0,01\times540\right)\times11\)

\(=5,4\times\left(36,8+52,2\right)+5,4\times11\)

\(=5,4\times89+5,4\times11\)

\(=5,4\times\left(89+11\right)\)

\(=5,4\times100=540\)

chúc e học tốt

540 là answer nha