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7 x 5 x 36 + 35 x 42 + 35 x 22
= 35 x 36 +35 x 42 + 35 x 22
= 35 x ( 36 + 42 + 22 )
= 35 x 100
= 3500
\(a,\frac{2}{3}.\frac{4}{5}+\frac{1}{3}.\frac{2}{5}\)
= \(\frac{2}{5}.\frac{4}{3}+\frac{1}{3}.\frac{2}{5}=\frac{2}{5}\left(\frac{4}{3}+\frac{1}{3}\right)=\frac{2}{5}.\frac{5}{3}=\frac{2}{3}\)
\(\frac{5}{4}+\frac{7}{12}+\frac{7}{5}+\frac{75}{100}+\frac{40}{25}+\frac{20}{48}\)
\(=\frac{5}{4}+\frac{7}{12}+\frac{7}{5}+\frac{3}{4}+\frac{8}{5}+\frac{5}{12}\)
\(=\left(\frac{5}{4}+\frac{3}{4}\right)+\left(\frac{7}{12}+\frac{5}{12}\right)+\left(\frac{7}{5}+\frac{8}{5}\right)\)
\(=\frac{8}{4}+\frac{12}{12}+\frac{15}{5}\)
\(=2+1+3\)
\(=6\)
Đặt A=5/4 + 7/12 + 7/5 + 75/100 + 40/25 + 20/48
=>A=125/100 + 28/48 + 35/25 + 75/100 + 40/25 + 20/48
=>A=(125/100 + 75/100) + (28/48 + 20/48) + (35/25 + 40/25)
=>A= 2 + 1 + 3
=>A= 6
Vậy A=6
\(3.5.36+15.42+30.11\)
\(=15.36+15.42+15.\left(2.11\right)\)
\(=15.36+15.42+15.22\)
\(=15.\left(36+42+22\right)\)
\(=15.100=1500\)
3x5x36+15x42+30x11
=15x36+15x42+15x2x11
=15x36+15x42+15x22
=15x(36+42+22)
=15x100
=1500
Ta có :
16 - 2 x 8 = 16 - 16 = 0
Số nào nhân với 0 cũng bằng 0
Dãy trên = 0
a) \(\frac{2}{3}+\frac{3}{4}+\frac{4}{5}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}\)
= \(\left(\frac{2}{3}+\frac{1}{3}\right)+\left(\frac{3}{4}+\frac{1}{4}\right)+\left(\frac{4}{5}+\frac{1}{5}\right)\)
= \(\frac{3}{3}+\frac{4}{4}+\frac{5}{5}\)
= \(1+1+1\)
= \(3\)
b) \(\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{4}{6}+\frac{9}{12}+\frac{16}{20}\)
= \(\left(\frac{1}{3}+\frac{4}{6}\right)+\left(\frac{1}{4}+\frac{9}{12}\right)+\left(\frac{1}{5}+\frac{16}{20}\right)\)
= \(\left(\frac{1}{3}+\frac{2}{3}\right)+\left(\frac{1}{4}+\frac{3}{4}\right)+\left(\frac{1}{5}+\frac{4}{5}\right)\)
= \(\frac{3}{3}+\frac{4}{4}+\frac{5}{5}\)
= \(1+1+1\)
= \(3\)
ko sai được... đúng 100%
a)2/3+3/4+4/5+1/3+1/4+1/5
= ( 2/3 + 1/3 ) + ( 3/4 + 1/4 ) + ( 4/5 + 1/5 )
= 1 + 1 + 1 = 3
b) 1/3 + 1/4 + 1/5 + 4/6 + 9/12 + 16/20
= 1/3 + 1/4 + 1/5 + 2/3 + 3/4 4/5
= ( 1/3 + 2/3 ) + ( 1/4 + 3/4 ) + ( 1/5 + 4/5 )
= 1 + 1 + 1 = 3
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11 + 19 + 12 + 18 + 13 + 17 + 14 + 16 + 15
= 30 + 30 + 30 + 30 + 15
= 120 + 15 = 135
11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19
= ( 11 + 19 ) + ( 12 + 18 ) + ( 13 + 17 ) + ( 14 + 16 ) + 15
= 30 + 30 + 30 + 30 + 15
= 30 x 4 + 15
= 120 + 5
= 135 .
#Songminhnguyệt
A = 1 + 2 – 3 – 4 + 5 + 6 – 7 – 8 + … + 21 + 22
A= (1+2 - 3 - 4) + (5+6-7-8) +....+ (21+22)
A=-4 + (-4) +... + 43 (5 số hạng (-4)
A= -4 x 5 + 43
A= 43 - 20 = 23