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Trả lời :
25 x 8 x 50 x 125 x 4 x 2
= ( 25 x 4 ) x ( 8 x 125 ) x ( 50 x 2 )
= 100 x 1000 x 100
= 100 000 000
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a) 2024 . 33 + 2024 + 4048 . 33
= 2024 . 33 + 2024 . 1 + 2024 . 2 . 33
= 2024 . ( 33 + 1 + 66 )
= 2024 . 100
= 202400
2024×33+2024+4048×33=
\(\left(\right. 2024 + 4048 \left.\right) \times 33 + 2024\)
\(2024 + 4048 = 6072\)
\(6072 \times 33 = 200376\)
\(2024\): \(200376 + 2024 = 202400\)
b)
\(8 \times \frac{1}{6} + 8 \times \frac{2}{6} + 8 \times \frac{3}{6}\)
\(\frac{1}{6} + \frac{2}{6} + \frac{3}{6} = \frac{6}{6} = 1\)
\(8 \times 1 = 8\)
a) 3254 + 146 + 1698 = 3400 + 1698
= 3400 + 1600 + 98
= 5000 + 98
= 5098
4367 + 199+501 = 4367 + 700
= 4300 + 700 + 67 = 5000 + 67 = 5067
4400 + 2148 + 252
= 4400 + 2400 = 6800
b) 921 + 898 + 2079
= 921 + 2079 + 898
= 3000 + 898 = 3989
1255 + 436 + 145
= 1400 + 436 = 1836
467 + 999 + 9533
= 10000 + 999 = 10999
=\(\frac{3}{4}\times\left(\frac{8}{9}+\frac{2}{3}\right)\)
\(=\frac{3}{4}\times\frac{14}{9}\)
\(=\frac{7}{6}\)
\(\frac{8}{15}:\frac{2}{11}+\frac{7}{15}:\frac{2}{11}\)
\(=\left(\frac{8}{15}+\frac{7}{15}\right):\frac{2}{11}\)
\(=1:\frac{2}{11}\)
\(=\frac{11}{2}\)
\(\frac{19}{15}+\frac{31}{23}-\frac{4}{15}-\frac{8}{23}\)
\(=\left(\frac{19}{15}-\frac{4}{15}\right)+\left(\frac{31}{23}-\frac{8}{23}\right)\)
\(=\frac{15}{15}+\frac{23}{23}\)
\(=1+1=2\)
\(\frac{19}{15}+\frac{31}{23}-\frac{14}{15}-\frac{8}{23}\)
\(=\frac{19}{15}-\frac{4}{15}+\frac{31}{23}-\frac{8}{23}\)
\(=1+1=2\)
chúc bạn học giỏi
a/ \(\frac{3}{8}:\frac{9}{10}=\frac{3}{8}.\frac{10}{9}=\frac{3.5.2}{4.2.3.3}=\frac{5}{12}\)
b/ \(\frac{4}{9}:\frac{12}{8}=\frac{4}{9}.\frac{8}{12}=\frac{2.4.4}{3.3.3.4}=\frac{8}{27}\)
a) 3/8 chia 9/10=3/8x10/9=5/12
b)4/9 chia 12/8=4/9x8/12=8/27
a.
= ( 8921 × 4 )+ 8921 − 8921 + 7
= 35684 + 0 + 7
= 35684 + 7
= 35691
b.
= ( 22775 - 2225 ) + ( 3832 + 823 )
= 20550 + 4655
= 25205
a. 8 921 x 4 + 8 921 + 7 - 8 921
= 8 921 x (4 + 7 - 1)
= 8 921 x 1
= 89 210
b. 22 775 - 823 + 3 832 + 2 225
= (22 775 + 2 225) + (3 832 - 823)
= 25 000 + 3 009
= 28 009
[sửa]
a. 8 921 x 4 + 8 921 + 7 - 8 921
= 8 921 x (4 + 7 - 1)
= 8 921 x 10
= 89 210
b. 22 775 - 823 + 3 832 + 2 225
= (22 775 + 2 225) + (3 832 - 823)
= 25 000 + 3 009
= 28 009
a.
= ( 8921 × 4 )+ 8921 − 8921 + 7
= 35684 + 0 + 7
= 35684 + 7
= 35691
b. sửa
( 22 775+2 225)−823+3 832
= 25 000−823+3 832
= 25 000+(3 832−823)
= 25 000+3 009
= 28 009