5x5x5x5x9x9x9x9x9x9x90x90x99x99x99

= [ 5x4] x [9x6] x [ 90x2] x [ 99x3 ]

= 20 x 54 x180 x 297

= 1080 x 53460

= 57736800

=1.3 18440352

bằng báo cáo

\(\dfrac{2}{4}X\dfrac{4}{9}+\dfrac{4}{5}X\dfrac{4}{9}-\dfrac{4}{9}X\dfrac{1}{5}\)

=22/45

2 x 5 + 5 x 7 + 9 x 3 

= 5 x ( 2 + 7 ) + 9 x 3 

= 5 x 9 + 9 x 3 

= 9 x ( 5 + 3 )

= 9 x 8

= 72

2x5+5x9+9x3                                       15:5+27:5+8:5

=9x5+(2+3)                                         =(15+8+27):5

=9x5+5                                               =50:5

=9x5+5x1                                            =10

=5x(9+1)                                             9+9x3+18:2x6

=5x10                                               =1x9+9x3+9x6

=50                                                   =9x(1+6+3)

                                                         =9x10

                                                         =90

\(15:5+27:5+8:5\)

\(=15\times\frac{1}{5}+27\times\frac{1}{5}+8\times\frac{1}{5}\)

\(=\left(15+27+8\right)\times\frac{1}{5}\)

\(=50\times\frac{1}{5}\)

\(=10\)

cả hai phép = 0

ghi ra

(45-5x9)x1x2x3x4x5x6x7 

= 0         x1x2x3x4x5x6x7

=0

(1+2+3+4+5+6+7+8+9+10)x(72-8x8-8)

=(1+2+3+4+5+6+7+8+9+10)x0

= 0

#Ninh Nguyễn

a: =35/17-18/17-9/5+4/5

=1-1=0

b: =-7/19(3/17+8/11-1)

=7/19*18/187=126/3553

c: =26/15-11/15-17/3-6/13

=1-6/13-17/3

=7/13-17/3=-200/39

Các bạn giúp mình với mình đang cần gấp lắm

\(\frac{7}{3}.9-\frac{9}{4}.5+\frac{11}{5}.6-\frac{13}{6}.7+\frac{15}{7}.8-\frac{17}{8}.9+\frac{19}{9}.10\)

\(=21-\frac{45}{4}+\frac{66}{5}-\frac{91}{6}+\frac{120}{7}-\frac{153}{8}+\frac{190}{9}\)

\(=26,91230159\)

Lớp mấy đó

-14/45