125,98- 125,48 = 0,5 - 52,25 = -51,75

\(\dfrac{2}{3}\times\dfrac{3}{4}+\dfrac{3}{4}\times\dfrac{2}{5}=\dfrac{3}{4}\times\left(\dfrac{2}{3}+\dfrac{2}{5}\right)=\dfrac{3}{4}\times\dfrac{16}{15}=\dfrac{4}{5}\)

0.8

0,8

\(31.82+125.48+31.43-125.67\)

\(=31\left(82+43\right)-125\left(67-48\right)\)

\(=31.125-125.19\)

\(=125.12\)

\(=1500\)

Đề sai ko bạn?? 48 với 49 sao tính nhanh đc

48x125+875x49 = 48x125 + 48x875 + 875

                        =  48x(125+875) + 875

                        = 48 x 1000 +875

                        = 48000 + 875 = 48875

đấy là cách nhanh nhất theo  mình ( nếu có cách nào nhanh hơn cảm phiền bn có thể chia sẻ vs mìn đc hông)
 

73×(-48)×125 

= -73 x 6 x 8 x 125

= - 438 x 1000

= - 438000

-438000

73.(-48).125

=73.(-6000)

=-438000

Chúc bn học tốt

a) \(48.19+48.15+134.52\)

\(=48\left(19+15\right)+6968\)

\(=48.34+6968\)

\(=1632+6968\)

\(=8600.\)

b) \(27.121-87.27+73.34\)

\(=27\left(121-87\right)+73.34\)

\(=27.34+73.34\)

\(=34\left(27+73\right)\)

\(=34.100\)

\(=3400.\)

c) \(125.98-125.46-52-25\)

\(=125\left(98-46\right)-52-25\)

\(=125.52-52-25\)

\(=52\left(125-1\right)-25\)

\(=52.124-25\)

\(=6448-25\)

\(=6423.\)

d) \(136.23+136.17-40.36\)

\(=136\left(23+17\right)-40.36\)

\(=136.40-40.36\)

\(=40\left(136-36\right)\)

\(=40.100\)

\(=4000.\)

e) \(66.25+5.66+66.14+33.94\)

\(=33\left(2.50+5.2+14.2+94\right)\)

\(=33\left(50+10+28+94\right)\)

\(=33.182\)

\(=6006.\)

73*((-48)*125)=73*-6000=-438000

ok học tốt !!!

\(a,\\ 52^2+52.48=52.52+52.48=52.\left(52+48\right)=52.100=5200\\ b,\\ 39^2-39.29=39.39-39.29=39.\left(39-29\right)=39.10=390\\ c,\\ 99.5^3+125=99.125+125=125.\left(99+1\right)=125.100=12500\)

a) 52² + 52 . 48 = 2704 + 2496 = 5200

b) 39² - 39 . 29 = 1521 - 1131 = 390

c) 99 . 5³ + 125 = 99 . 125 + 125 = 12375 + 125 = 12400

\(2\times5\times\dfrac{11}{3}\times11\times5=\left(2\times5\times5\right)\times\left(\dfrac{11}{3}\times11\right)=50\times\dfrac{121}{3}=\dfrac{6050}{3}\)

2 x 5 x 11/3 x 11 x 5 

= 10 x 11/3 x 11 x 5

=   ( 10 x 5 ) x( 11/3 x 11)

=  50             x  121/3

= 6050/3

2 x 5 x 11/3 x 11 x 5 

= 10 x 11/3 x 11 x 5

=   ( 10 x 5 ) x( 11/3 x 11)

=  50             x  121/3

= 6050/3