( 4,2 )5 : ( 23 . 1/6 )
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a) \(20,06\cdot71+20,06\cdot23+6\cdot20,06\)
\(=20,06\left(71+23+6\right)\)
\(=20,06\cdot100\)
\(=2006\)
b) \(6,75\cdot4,2+4,2\cdot3,25\)
\(=4,2\left(6,75+3,25\right)\)
\(=4,2\cdot10\)
\(=42\)
a. 20,06 * 71 + 20,06 * 23 + 6 * 20,06
= 20,06 * [ 71+23+6]
= 20,06 * 100
=2006
b, 6,75 * 4,2 + 4,2 * 3,25
=4,2 * [ 6,75 + 3,25]
= 4,2 * 10
=42
- Lưu ý dấu * là nhân nhé
\(\left(6:3,5-1\dfrac{1}{6}\times\dfrac{6}{7}\right):\left(4,2\times\dfrac{10}{11}+5\dfrac{2}{11}\right)\\ =\left(\dfrac{12}{7}-\dfrac{7}{6}\times\dfrac{6}{7}\right):\left(\dfrac{21}{5}\times\dfrac{10}{11}+\dfrac{57}{11}\right)\\ =\left(\dfrac{17}{7}-1\right):\left(\dfrac{42}{11}+\dfrac{57}{11}\right)\\ =\dfrac{10}{7}:9\\ =\dfrac{10}{63}\)
\(\left(6:\dfrac{3}{5}-1\dfrac{1}{6}\times\dfrac{6}{7}\right):\left(4,2\times\dfrac{10}{11}+5\dfrac{2}{11}\right)\)
\(=\left(6\times\dfrac{5}{3}-\dfrac{7}{6}\times\dfrac{6}{7}\right):\left(\dfrac{21}{5}\times\dfrac{10}{11}+\dfrac{57}{11}\right)\)
\(=\left(10-1\right):\left(\dfrac{42}{11}+\dfrac{57}{11}\right)=9:9=1\)
1: =7/6:(-21/5)-25*0,2
=-7/6*5/21-5
=-35/126-5
=-5/21-5
=-5/21-105/21=-110/21
3: \(=\dfrac{7}{12}+\dfrac{5}{72}-\dfrac{11}{36}=\dfrac{42+5-22}{72}=\dfrac{25}{72}\)
\(a,14,75-7,15:5+2,6\times3,5\\ =14,75-1,43+9,1\\ =13,32+9,1\\ =22,42\\ b,13,5:4,5\times2,4+\left(156,9-80,6\right)\\ =13,5:4,5\times2,4+76,3\\ =3\times2,4+76,3\\ =7,2+76,3\\ =83,5\\ c,1,25\times4,2+119,6:5,2-23,19\\ =5,25+23-23,19\\ =28,25-23,19\\ =5,06\)
b)8,3 - 1,4 - 3,6
=8,3 - (1,4 + 3,6)
=8,3 - 5
= 3,3
c)12,45 + 6,98 + 7,55
= (12,45 + 7 ,55) + 6,98
= 20 + 6,98
= 26,98
(nếu " ' " là nhân )
a)20,06 x 71 + 20,06 x 23 + 6 x 20,06
= 20,06 x (71 + 23 + 6 )
= 20,06 x 100
= 2006
d)6,75 x 4,2 + 4,2 x 3,25
= 4,2 x ( 6,75 + 3,25 )
= 4,2 x 10
= 42
Chúc bạn học tốt!
Tính bằng cách thuận tiện
23 x 4,2 + 23 x 4,5
= 23 x ( 4.2 + 4.5 )
= 23 x 8.7
= 200.1
L I K E mk nhé Khổng Thị Huệ
A, \(\dfrac{7}{9}\) = \(\dfrac{7\cdot5}{9\cdot5}\) = \(\dfrac{35}{45}\) \(\dfrac{3}{5}\) = \(\dfrac{3\cdot9}{5\cdot9}\) = \(\dfrac{27}{45}\)
Vậy \(\dfrac{7}{9}\) > \(\dfrac{3}{5}\)
B, \(\dfrac{3}{4}\) = \(\dfrac{3\cdot6}{4\cdot6}\) = \(\dfrac{18}{24}\) \(\dfrac{5}{6}\) = \(\dfrac{5\cdot4}{6\cdot4}\) = \(\dfrac{20}{24}\)
Vậy \(\dfrac{3}{4}\) < \(\dfrac{5}{6}\)
C, \(\dfrac{1}{4}\) = \(\dfrac{1\cdot3}{4\cdot3}\) = \(\dfrac{3}{12}\) \(\dfrac{2}{3}\) = \(\dfrac{2\cdot4}{3\cdot4}\) = \(\dfrac{8}{12}\)
Vậy \(\dfrac{1}{4}\) < \(\dfrac{2}{3}\)
D, \(\dfrac{8}{9}\) = \(\dfrac{8\cdot2}{9\cdot2}\) = \(\dfrac{16}{18}\) \(\dfrac{1}{2}\) = \(\dfrac{1\cdot9}{2\cdot9}\) = \(\dfrac{9}{18}\)
Vậy \(\dfrac{8}{9}\) > \(\dfrac{1}{2}\)
\(\cdot\) là dấu nhân
653.45662
mk nhầm phải là 1742.54976