= 2520

ok k cho mik đi

=444

vì số nào nhân với 0 thì bằng 0

\(53,68-37.63-12.37\)

\(=53,68-\left(37.63+12.37\right)\)

\(=53,68-\left[37\left(63+12\right)\right]\)

\(=53,68-\left[37.75\right]\)

\(=53,68-2775\)

\(=\text{-2721.32}\)

53,68-37.63-12.37=53,68-[37.(63+12)]

                              =53,68-(37.75)

                              =53,68-2775

                              =-2721.32

a. 45.34 + 45.37 + 71.23 + 33.71

= 45.(34 + 37) + 71.(23 + 33)

= 45.71 + 71.56

= 71.(45 + 56)

= 71 . 101

= 7171

a) \(45.34+45.37+71.23+33.71=45\left(34+37\right)+71\left(23+33\right)=45.71+71.56=71\left(45+56\right)=71.101=7171\)

b) \(23.46+23.52+98.35+98.42=23\left(46+52\right)+98\left(35+42\right)=23.98+98.77=98\left(23+77\right)=98.100=9800\)

c) \(27.34+27.56+90.20+26.90=27\left(34+56\right)+90\left(20+26\right)=27.90+90.46=90\left(27+46\right)=90.73=6570\)

d) \(12.37+12.78+115.29+115.59=12\left(37+78\right)+115\left(29+59\right)=115.12+115.88=115\left(12+88\right)=115.100=11500\)

b. 23.46 + 23.52 + 98.35 + 98.42

= 23.(46 + 52) + 98.(35+42)

= 23.98 + 98.77

= 98.(23 + 77)

= 98 . 100

= 9800

`[` Tham Khảo `]`

`35 xx 5 - 35 xx 2 + 35 xx7`

`= 35 xx (5-2+7)`

`= 35 xx 10`

`=350`

= 35 × (5 + 7 - 2)

= 35 × 10

= 350

=35×(5-2+7)

=35×10

=350

 370×25+370×74+370

= 370 x ( 25 + 74 +1)

= 370 x 100

= 37000

=370 nhân [25+74+1]

=37000

= (4x0,25)x15,6

= 1x15,6

=15,6

4 x 15,6 x 0,25

\(=\left(4\times0,25\right)\times15,6=1\times15,6=15,6\)