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3 × 25 × 8 + 4 × 37 × 6 + 2 × 38 × 12
= ( 3 × 8 ) × 25 + ( 4 × 6 ) × 37 + ( 2 × 12 ) × 38
= 24 × 25 + 24 × 37 + 24 × 38
= 24 × ( 25 + 37 + 38 )
= 25 × 100
= 2 500
35 × 34 + 35 × 66 + 65 × 55 + 65 × 45
= 35 × ( 34 + 66 ) + 65 × ( 55 + 45 )
= 35 × 100 + 65 × 100
= 100 × ( 35 + 65 )
= 100 × 100
= 10 000
Cách 1 :
136 × 68 + 16 × 272
= 136 × 2 × 34 + 16 × 272
= 272 × 34 + 16 × 272
= 272 × ( 34 + 16 )
= 272 × 50
= 13 600
Cách 2 :
136 × 68 + 16 × 272
= 136 × 68 + 16 × 2 × 136
= 136 × 68 + 32 × 136
= 136 × ( 68 + 32 )
= 136 × 100
= 13 600
a) \(3.25.8+4.37.6+2.38.12=24.25+24.37+24.38\)
\(=24.\left(25+37+38\right)=24.100=2400\)
b) \(35.34+35.66+65.55+65.45\)
\(=35.\left(34+66\right)+65.\left(55+45\right)=35.100+65.100\)
\(=100.\left(35+65\right)=100.100=10000\)
c) \(136.68+16.272=136.68+32.136\)
\(=136.\left(68+32\right)=136.100=13600\)
p/s: dấu "." là dấu nhân
\((2,5\cdot x+2017)\cdot2018=(7,5+2017)\cdot2018\)
\(\Rightarrow(2,5\cdot x+2017)\cdot2018=4085441\)
\(\Rightarrow2,5\cdot x+2017=2024,5\)
\(\Rightarrow2,5x=7,5\)
\(\Rightarrow x=7,5:2,5=3\)
\(3\frac{1}{5}+\frac{2}{5}\left[x+\frac{1}{3}\right]=\frac{21}{5}\)
\(\Rightarrow\frac{16}{5}+\frac{2}{5}\left[x+\frac{1}{3}\right]=\frac{21}{5}\)
\(\Rightarrow\frac{2}{5}\left[x+\frac{1}{3}\right]=\frac{21}{5}-\frac{16}{5}\)
\(\Rightarrow\frac{2}{5}\left[x+\frac{1}{3}\right]=1\)
\(\Rightarrow x+\frac{1}{3}=\frac{5}{2}\)
\(\Rightarrow x=\frac{13}{6}\)
x + 13.5=34
x + 65 =34
x =34 - 65
x = -31
\(\frac{6}{5}\) - x = \(\frac{1}{2}\)
x = \(\frac{6}{5}\) - \(\frac{1}{2}\)
x = \(\frac{7}{10}\)
x + 13,5 = 34
x =34-13,5
x =20,5
6/5 - x = 1/2
x =6/5- 1/2
x =12/10 - 5/10
x =7/10
35x24+70+73x35+35
= 35x24+35x2+73x35+35
=35x(24+2+73+1)
=35x100
=3500
\(x+x\div5+x\div2=34\)
\(\Leftrightarrow x+x.\frac{1}{5}+x.\frac{1}{2}=34\)
\(\Leftrightarrow x\left(1+\frac{1}{5}+\frac{1}{2}\right)=34\)
ez rồi, tự giải tiếp
x + x : 5 + x: 2 = 34
x + x: ( 5 + 2 ) = 34
x + x : 7 = 34
x + x = 34 * 7
2x = 238
x = 238 : 2
x = 119
683 x 35 = 23905
1954 x 425 = 830450
2438 x 425 = 1036150
KB VS NHA!
683 . 35 = 23905
1954 . 425 = 68404875
2438 . 425 = 1036150
4/6 + 3 = \(\frac{11}{3}\)
3/5 x 7/4 - 1/3 = \(\frac{43}{60}\)
9/8 - 1/7 = \(\frac{55}{56}\)
2 : 34/6 = \(\frac{6}{17}\)
Học tốt
\(\frac{4}{6}+3=3\frac{4}{6}\)
\(\frac{3}{5}\cdot\frac{7}{4}-\frac{1}{3}=\frac{21}{20}-\frac{1}{3}=\frac{63-20}{60}=\frac{43}{60}\)
\(\frac{9}{8}-\frac{1}{7}=\frac{63-8}{56}=\frac{55}{56}\)
\(2:\frac{34}{6}=2\cdot\frac{6}{34}=\frac{6}{17}\)
46410
35 * 34 * 39
= 1190 * 39
= 46410