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a) 17,6 - 5,3 + 16,8 - 7,6 + 15,3 - 6,8
= ( 17,6 - 7,6 ) + ( 16,8 - 6,8 ) + ( 15,3 - 5,3 )
= 10 + 10 + 10
= 30
b) 3,54 . 73 + 0,46 . 25 + 3,54 . 26 + 0,46 . 75 + 3,54
= 3,54 ( 73 + 26 + 1 ) + 0,46 ( 25 + 75 )
= 3,54 . 100 + 0,46 . 100
= 100 ( 3,54 + 0,46 )
= 100 . 4
= 400
a, 17,6 - 5,3 + 16,8 - 7,6 + 15,3 - 6,8
= ( 17,6 - 7,6 ) + ( 16,8 - 6,8 ) + ( 15,3 - 5,3 )
= 10 + 10 + 10
= 30
a) \(3,54.73+0,23.25+3,54.27+0,17.25\)
\(=3,54.\left(73+27\right)+25.\left(0,23+0,17\right)\)
\(=3,54.100+25.0,4\)
\(=354+10\)
\(=364\)
b) \(12,25:\left(5\frac{9}{20}-4\frac{1}{5}\right)+2,4.3\)
\(=12,25:\left(\frac{109}{20}-\frac{21}{5}\right)+7,2\)
\(=12,25:1,25+7,2\)
\(=9,8+7,2\)
\(=17\)
a,3, 54 x 73 + 0,23 x 25 + 3,54 x 27 + 0,17 x 25
= 3,54 x 73 + 3,54 x 27 + 0,23 x 25 + 0,17 x 25
= 3,54 x(73+27) + 25 x (0,23+0,17)
= 3,54 x 100 + 25 x 0,4
= 3,54 x 100 + 10
= 35,4 x 10 + 10
= 10 x (35,4+1)
= 10 x 36,4
= 364
b,12 , 25 : ( \(5\frac{9}{20}-4\frac{1}{5}\)) + 2 , 4 . 3
= 12 , 25 : ( 109 / 20 - 105 /20 ) + 7 , 2
= 12 , 25 : 1/5 + 7, 2
= \(\frac{1225}{1000}\): \(\frac{3}{2}\) + \(\frac{36}{5}\)
= ( bạn tính nốt nha )
Chúc bạn học tốt !
3, 54 x 73 + 0,23 x 25 + 3,54 x 27 + 0,17 x 25
= 3,54 x 73 + 3,54 x 27 + 0,23 x 25 + 0,17 x 25
= 3,54 x(73+27) + 25 x (0,23+0,17)
= 3,54 x 100 + 25 x 0,4
= 3,54 x 100 + 10
= 35,4 x 10 + 10
= 10 x (35,4+1)
= 10 x 36,4
= 364
1) 2-2+2-2=0;2/2*2/2=1;2/2+2/2=2;2-2/2+2=3;2+2-2+2=4;2+2+2/2=5;2*(2/2+2)=6;2+2+2+2=8;22/2-2=9;(22-2)/2=10
(còn số 7 không làm được)
2) a) \(52\cdot\frac{y}{78}=3380\)
\(52\cdot\frac{1}{78}\cdot y=3380\)
\(\frac{2}{3}\cdot y=3380\)
\(y=3380\div\frac{2}{3}=5070\)
b)\(55-y+33=76\)
\(88-y=76\)
\(y=88-76=12\)
3)\(3,54\cdot73+0,23\cdot25+3,54\cdot27+0,17\cdot25\)
\(=3,54\cdot\left(73+27\right)+25\cdot\left(0,27+0,13\right)\)
\(=3,54\cdot100+25\cdot0,4\)
\(=354+10=364\)
3,54 x 73 + 0,23 x 25 + 3,54 x 27 + 0,17 x 25
= 3,54 x ( 73 + 27 ) + 25 x ( 0,23 + 0,17 )
= 3,54 x 100 + 25 x 0,4
= 354 + 10
= 364
=3.54x(73+27)+25x(0.23+0.17)
=3.54x100+25x0.4
=354+10
=364
(k mk nha bn )
a) \(\frac{5}{6}+\frac{11}{12}+\frac{19}{20}+\frac{29}{30}+\frac{41}{42}+\frac{55}{56}+\frac{71}{72}+\frac{89}{90}\)
\(=1-\frac{1}{6}+1-\frac{1}{12}+1-\frac{1}{20}+1-\frac{1}{30}+1-\frac{1}{42}+1-\frac{1}{56}+1-\frac{1}{72}+1-\frac{1}{90}\)
\(=8-\left(\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}+\frac{1}{90}\right)\)
\(=8-\left(\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}+\frac{1}{9.10}\right)\)
\(=8-\left(\frac{3-2}{2.3}+\frac{4-3}{3.4}+\frac{5-4}{4.5}+\frac{6-5}{5.6}+\frac{7-6}{6.7}+\frac{8-7}{7.8}+\frac{9-8}{8.9}+\frac{10-9}{9.10}\right)\)
\(=8-\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}+\frac{1}{9}-\frac{1}{10}\right)\)
\(=8-\left(\frac{1}{2}-\frac{1}{10}\right)=7,6\)
b) Bạn làm tương tự.
a) ( 01,2 + 2+3+4 ) x 201,2
= 811
mình chỉ làm đc câu a thôi