Tính bằng cách thuật tiện nhất:
628x22+628x34+628x44
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3,45x0,99+3,45:100=\(3,45\times\frac{99}{100}+3,45\times\frac{1}{100}\)
=\(3,45\times\left(\frac{99}{100}+\frac{1}{100}\right)\)
=\(3,45\times1\)
=3,45
ok chưa bạn?
3,45x0,9+3,45:100= \(3,45\times\frac{9}{10}+3,45\times\frac{1}{100}\)
=\(3,45\times\left(\frac{90}{100}+\frac{1}{100}\right)\)
=\(3,45\times\frac{91}{100}\)
=3,1395
chúc bạn học tốt +-*/
7/19 . 1/3 + 7/19 . 2/3 =7/19 .(1/3 + 2/3)= 7/19 . 1 = 7/19
\(0,75.95+1,5.2+0,75=0,75.95+0,75.2.2+0,75\)
\(=0,75.95+0,75.4+0,75=0,75.\left(95+4+1\right)=0,75.100=75\)
0,75 x 95 + 1,5 x 2 + 0,75
= 0,75 x 95 + 0, 75 x 2 x 2 + 0,75 x 1
= 0,75 x 95 + 0,75 x 4 + 0,75 x 1
= 0,75 ( 95 + 4 + 1 )
= 0,75 x 100
= 75
a) 425 x 3475 + 425 x 6525
= 425 x (3475 + 6525)
= 425 x 10000
= 4250000
b) 175 x 1274 - 175 x 273 - 175
= 175 x 1274 - 175 x 273 - 175 x 1
= 175 x (1274 - 273 - 1)
= 175 x 1000
= 175000
a) \(2,23\cdot0,1+3,34:10+1:10\cdot4,43\)
\(=2,23\cdot0,1+3,34\cdot0,1+4,43\cdot0,1\)
\(=0,1\cdot\left(2,23+3,34+4,43\right)\)
\(=1\)
b) \(4,5:100+5,4\cdot0,01+1:100\cdot0,1\)
\(=4,5\cdot0,01+5,4\cdot0,01+0,1\cdot0,01\)
\(=0,01\left(4,5+5,4+0,1\right)\)
\(=0,1\)
\(\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{4}{6}+\frac{9}{12}+\frac{16}{20}\)
\(=\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{2}{3}+\frac{3}{4}+\frac{4}{5}\)
\(=\left(\frac{1}{3}+\frac{2}{3}\right)+\left(\frac{1}{4}+\frac{3}{4}\right)+\left(\frac{1}{5}+\frac{4}{5}\right)\)
\(=\frac{3}{3}+\frac{4}{4}+\frac{5}{5}\)
\(=1+1+1\)
\(=3\)
\(\dfrac{1}{3}+\dfrac{1}{4}+\dfrac{1}{5}+\dfrac{4}{6}+\dfrac{9}{12}+\dfrac{16}{20}\)
\(=\dfrac{1}{3}+\dfrac{1}{4}+\dfrac{1}{5}+\dfrac{2}{3}+\dfrac{3}{4}+\dfrac{4}{5}\)
\(=\left(\dfrac{1}{3}+\dfrac{2}{3}\right)+\left(\dfrac{1}{4}+\dfrac{3}{4}\right)+\left(\dfrac{1}{5}+\dfrac{4}{5}\right)\)
\(=\dfrac{3}{3}+\dfrac{4}{4}+\dfrac{5}{5}\)
\(=1+1+1=3\)
628x22+628x34+628x44
=628x(22+34+44)
=628x 100
=62800
628 x ( 22 + 34 + 44 )
628 x 100
62800