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Tính thuận tiện :
19,76 x 98,68 - 19,76 x 36,49 + 19,76 x 37,81
= ( 98,68 - 36,49 + 37,81 ) x 19,76
= 100 x 19,76
= 1976.
.>>>>>
25 : 0,5 x 0,2 : 0,25 x 0,5 x 0,25
= (0,5 : 0,5) x (0,25 : 0,25) x ( 25 x0,2)
= 1 x 1 x 5
= 5
12,12 x 7,5 + 12,12 : 2 + 12,12 + 12,12
= 12,12 x 7,5 + 12,12 x 0,5 + 12,12 x 1 + 12,12 x 1
= 12,12 x (7,5 + 0,5 + 1 + 1)
= 12,12 x 10
= 121,2
(4,329 : 0,001 - 43,29 x 100) x 150 + 2018 + 2019 : 10000
= (4,329 x 1000 - 4329) x 150 + 2018 + 2019 : 10000
= (4329 - 4329) x 150 + 2018 + 2019 : 10000
= 0 x 150 + 2018 + 0,2019
= 0 + 2018 + 0,2019
= 2018 + 0,2019
= 2018,2019
999 x 3,5 + 3,5 = 3,5 x (999+1) = 3,5 x 1000 = 3500
k mk nha
25 x 5,5 + 25 : 0,25 + 25 :2
=25 x 5,5 + 25 x 4 + 25 x0,5
=25 x ( 5,5+4+0,5)
=25 x 10
=250
25 x 5,5 + 25 : 0,25 + 25 : 2
= 25 x 5,5 + 25 x 4 + 25 x 0,5
= 25 x ( 5,5 + 4 + 0,5)
= 25 x 10
= 250
a; 5\(\dfrac{3}{4}\) : 3 + 2\(\dfrac{1}{4}\).\(\dfrac{1}{3}\) - \(\dfrac{3}{8}\)
= \(\dfrac{23}{4}\) : 3 + \(\dfrac{9}{4}\).\(\dfrac{1}{3}\) - \(\dfrac{3}{8}\)
= \(\dfrac{23}{4}\) x \(\dfrac{1}{3}\) + \(\dfrac{3}{4}\) - \(\dfrac{3}{8}\)
= \(\dfrac{23}{12}\) + \(\dfrac{3}{4}\) - \(\dfrac{3}{8}\)
= \(\dfrac{46}{24}\) + \(\dfrac{18}{24}\) - \(\dfrac{9}{24}\)
= \(\dfrac{64}{24}\) - \(\dfrac{9}{24}\)
= \(\dfrac{55}{24}\)
2021 x 2021 - 2019 x 2023
= (2019 +2) x ( 2023 -2) - 2019 x 2023
= 2019 x 2023 - 2 x 2019 + 2 x 2023 - 4 - 2019 x 2023
= ( 2019 x 2023 - 2019 x 2023) + 2 x ( 2023 - 2019) - 4
= 0 + 2 x 4 - 4
= 8 - 4
= 4
2021 x 2021 - 2019 x 2023
= (2019 +2) x ( 2023 -2) - 2019 x 2023
= 2019 x 2023 - 2 x 2019 + 2 x 2023 - 4 - 2019 x 2023
= ( 2019 x 2023 - 2019 x 2023) + 2 x ( 2023 - 2019) - 4
= 0 + 2 x 4 - 4
= 8 - 4
= 4
Ta có: \(0,75\times\dfrac{1}{2}+\dfrac{3}{4}:2\)
\(=\dfrac{3}{4}\times\dfrac{1}{2}+\dfrac{3}{4}\times\dfrac{1}{2}\)
\(=\dfrac{3}{4}\times\left(\dfrac{1}{2}+\dfrac{1}{2}\right)=\dfrac{3}{4}\)
0,75