= 9740,641 - 3498,641 + 100

= 6342

cái này là tính nhanh ạ =))

e)\(\frac{0,1997+2,5\cdot12,5\cdot0,4\cdot0,08+8,003}{1,25\cdot2,5\cdot8\cdot4}=\frac{0,1997+1+8,003}{100}=\frac{2}{100}=\frac{1}{50}\)

g)\(\frac{\left(10,6524+0,3476\right)\cdot125\cdot0,4+8}{4\cdot0,1\cdot8\cdot0,25\cdot125}=\frac{11\cdot125\cdot0,4+8}{100}=\frac{558}{100}=5,58\)

Mk bó tay, chân.

Bạn ''Nguyễn Tiến Dũng'' làm đúng ròi đó.

Hok tốt !

g)1,25 x 6,54 x 8

=(1,25 x 8) x 6,54

=10 x 6,54

=65,4

\(a,x +18,7=65,5:2,5\)

\(\Leftrightarrow x+18,7=26,2\)

\(\Leftrightarrow x=26,2-18,7\)

\(\Leftrightarrow x=7,5\)

Vậy \(x=7,5\).

\(b,6,3.x=83,65-20,02\)

\(\Leftrightarrow6,3.x=63,63\)

\(\Leftrightarrow x=63,63:6,3\)

\(\Leftrightarrow x=10,1\)

Vậy \(x=10,1\).

\(c,x:12,5=1,25:2,5\)

\(\Leftrightarrow x:12,5=0,5\)

\(\Leftrightarrow x=0,5.12,5\)

\(\Leftrightarrow x=6,25\)

Vậy \(x=6,25\).

a) 725,16 x 1,25 x 0,4 x 8 x 2,5

= 725,16 x ( 1,25 x 8 ) x ( 0,4 x 2,5 )

= 725,16 x 10 x 1

= 7251,6

b) 937,6 x 98 + 937,6 + ( 907+30,6 )

= 937,6 x 98 + 937,6 + 937,6

= 937,6 x 98 + 937,6 x 2

= 937,6 x ( 98 + 2 )

= 937,6 x 100

= 93760

a)725,16*1,25*0,4*8*2,5=725,16*(1,25*8)*(0,4*2,5)=725,16*10*1=7251,6

b)937,6*98+937,6+(907+30,6)=937,6*98+937,6*1+937,6*1=937,6*(98+1+1)=937,6*10=9376

a)725,16*1,25*0,4*8*2,5

=725,16*(1,25*8)*(0,4*2,5)

=725,16*10*1

=7251,6

b)937,6*98+937,6+(907+30,6)

=937,6*98+937,6*1+937,6*1

=937,6*(98+1+1)

=937,6*10

=9376

a, \(\left(x-158\right):6=20\)

\(x-158=20.6\)

\(x-158=120\)

\(x=120+158\)

\(x=278\)

~~~Hok tốt~~~

a) \(\left(x-158\right):6=20\)

\(\Leftrightarrow x-158=\frac{20}{6}=\frac{10}{3}\)

\(\Leftrightarrow x=\frac{10}{3}+158\)

\(\Leftrightarrow x=\frac{484}{3}\)

Vậy : \(x=\frac{484}{3}\)

b) \(x-1,25.4=2,5\)

\(\Leftrightarrow x-5=2,5\)

\(\Leftrightarrow x=2,5+5\)

\(\Leftrightarrow x=7,5\)

Vậy : \(x=7,5\)

c) \(x+0,25=\frac{43}{4}-\frac{18}{5}\)

\(\Leftrightarrow x+\frac{1}{4}=\frac{143}{20}\)

\(\Leftrightarrow x=\frac{143}{20}-\frac{1}{4}\)

\(\Leftrightarrow x=\frac{69}{10}\)

Vậy : \(x=\frac{69}{10}\)

b, \(x-1,25.4=2.5\)

\(x-5=2,5\)

\(x=2,5+5\)

\(x=7.5\)

~~~Hok tốt ~~~

\(\frac{0,8\times0,4\times1,25\times2,5\times31,8+68,2}{0,1\times12,5\times4\times2,5\times2\times8\times0,2\times5}\)

\(=\frac{\left(0,8\times1,25\right)\times\left(0,4\times2,5\right)\times31,8+68,2}{0,1\times\left(12,5\times8\right)\times\left(4\times2,5\right)\times2\times\left(0,2\times5\right)}\)

\(=\frac{1\times1\times31,8+68,2}{0,1\times100\times10\times2\times1}\)

\(=\frac{31,8+68,2}{0,1\times100\times10\times2\times1}=\frac{100}{200}=\frac{1}{2}\)

ai làm đc mk trick cho

a)1h15p+75p+1,25hx8=75p+75p+600p=750p=12h30p

b)2p30 giây+15p-2,5px5=2,5p+15p-12,5p=5p

toan buoi 2 l5 cung phai hoi

A) 2,5 x 9,7x4

=( 2,5 x 4 )x 9,7

= 10 x 9,7

= 97

B) 1,25X 0,25 X4 X8

=( 1,25 X 8 ) X (0,25 X 8 )

= 10 X 1

= 10

C)12,5 x 0,8 x 10

=(12,5 x 0,8)x10

= 100 x 10

=1000

D) 0,025 x 10 x 4

= (0,025x 10)x4

= 0,25 x 4

=     1

CHÚC BN HỌC TỐT !