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a, 20,18 x 7,5 + 20,18 + 20,18 + 20,18 : 2
= 20,18 x 7,5 + 20,18 x 1 + 20,18 x 1 + 20,18 x 0,5
= 20,18 x ( 7,5 + 1 + 1 + 0,5)
= 20,18 x 10
= 201,8
b, 100 : 9 - 79,3 : 9
= (100 - 79,3) : 9
= 20,7 : 9
= 2,3
\(20,18\cdot2\frac{2}{5}+201,8\cdot\frac{97}{22}\cdot220\%+0,006\cdot2018\)
\(=2018\cdot\frac{1}{100}\cdot2\frac{2}{5}+2018\cdot\frac{1}{10}\cdot\frac{97}{22}+\frac{6}{1000}+2018\)
\(=2018\cdot\left(\frac{1}{100}\cdot2\frac{2}{5}+\frac{1}{10}\cdot\frac{97}{22}+6\cdot\frac{1}{1000}\right)\)
\(=2018\cdot\left[\frac{1}{1000}\cdot\left(6+100\cdot\frac{97}{22}+10\cdot2\frac{2}{5}\right)\right]\)
\(=\frac{1009}{500}\cdot\left[10\cdot\left(10\cdot\frac{97}{22}+\frac{12}{5}\right)\right]\)
\(=\frac{1009}{50}\cdot45\frac{12}{5}=\frac{239133}{250}\)
20,18 x 101 - 20,18
= 20,18 x (101 - 1)
= 20,18 x 100 = 2018
3,6 giờ x 5 + 216 phút x 2 + 3 giờ 36 phút x 3
= 3,6 giờ x 5 + 3,6 giờ x 2 + 3,6 giờ x 3
= 3,6 giờ x (5 + 2 + 3) = 3,6 giờ x 10 = 36 giờ
20.18 x 101 - 20.18
= 20.18 x 101 - 20.18 x 1
= 20.18 x ( 101 - 1 )
= 20.18 x 100
= 2018
Bài làm
C1: 20,18 x 37,9 + 201,8 x 4,5 + 201,8 x 1,75
= 764,822 + 908,1 + 353,15
= 2026,072
C2: 20,18 x 37,9 + 201,8 x 4,5 + 201,8 x 1,75
= 20,18 x 3,79 x 10 + 201,8 x 4,5 + 201,8 x 1,75
= 20,18 x 10 x 3,79 + 201,8 x 4,5 + 201,8 x 1,75
= 201,8 x 3,79 + 201,8 x 4,5 + 201,8 x 1,75
= 201,8 x ( 3,79 + 4,5 + 1,75 )
= 201,8 x 10,04
= 2026,072
C3: 20,18 x 37,9 + 201,8 x 4,5 + 201,8 x 1,75
= \(\frac{2018}{100}x\frac{379}{10}+\frac{2018}{10}x\frac{45}{10}+\frac{2018}{10}x\frac{175}{100}\)
= \(\frac{2018}{100}x\frac{379}{10}+\frac{2018}{10}x\left(\frac{45}{10}+\frac{175}{100}\right)\)
= \(\frac{2018}{100}x\frac{379}{10}+\frac{2018}{10}x\left(\frac{450}{100}+\frac{175}{100}\right)\)
= \(\frac{2018}{100}x\frac{379}{10}+\frac{2018}{10}x\frac{25}{4}\)
= \(\frac{382411}{500}+\frac{10090}{8}\)
= \(\frac{382411}{500}+\frac{630625}{500}\)
= \(\frac{1013036}{500}\)
= \(2026,072\)
# Chúc bạn học tốt #
a) 20,18 x 36 + 63 x 20,18 + 20,18
= 20,18 x ( 36+63+1)
= 20,18 x 100
= 2018
b) \(\frac{a}{b}\times\frac{3}{5}=\frac{1}{5}+\frac{2}{3}\)
\(\frac{a}{b}\times\frac{3}{5}=\frac{13}{15}\)
\(\frac{a}{b}=\frac{13}{15}:\frac{3}{5}\)
\(\frac{a}{b}=\frac{13}{9}\)
a) 20,18.(36+63+1)
= 20,18 . 100
= 2018
a/b . 3/5 =3/15 + 10/15
a/b . 3/5 =13/15
a/b = 13/15 : 3/5
a/b = 13/9
Tính bằng cách thuận tiện :
20,18 x 35,6 + 20,18 x 62,4 + 40,36
= 20,18 x ( 35,6 + 62,4 ) + 40,36
= 20,18 x 98 + 40,36
= 1977,64 + 40,36
= 2018
7,2 + 8,4 + 2,8 + 0,6
= 2,8 + 7,2 + 8,4 + 0,6
= 10 + 9
= 19
20,18 x35,6 + 20,18 x 62,4+40,36=20,18 x 35,6 + 20,18 x 62,4+ 20,18 x 2
=20,18 x ( 35,6+ 62,4+2)
=20,18 x 100
=2018
7,2 + 8,4 +2,8 +0,6=( 7,2 + 2,8) + ( 8,4+ 0,6)
=10 + 9
=19
\(20,18\times2\frac{2}{5}+201,8\times\frac{97}{22}\times220\%+0,006\times2018\)
\(=20,18\cdot\frac{12}{5}+20,18\cdot10\cdot\frac{97}{22}\cdot\frac{22}{10}+0,006\cdot100\cdot20,18\)
\(=20,18\cdot\frac{12}{5}+20,18\cdot\frac{970}{22}\cdot\frac{22}{10}+0,6\cdot20,18\)
\(=20,18\cdot\frac{12}{5}+20,18\cdot97+\frac{3}{5}\cdot20,18\)
\(=20,18\cdot\left(\frac{12}{5}+\frac{3}{5}\right)+20,18\cdot97\)
\(=20,18\cdot3+20,18\cdot97\)
\(=20,18\cdot\left(97+3\right)\)
\(=20,18\cdot100\)
\(=2018\)