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3/8 + 9/2 x 3/4 - 9/4 x 1/3
= 3/8 + 9/2 x 3/4 - 3/4
= 3/8 + (9/2 - 1) x 3/4
= 3/8 + 7/2 x 3/4
= 3/4 x 1/2 + 7/2 x 3/4
= 3/4 x ( 1/2 + 7/2 )
= 3/4 x 4
= 3
3/8 + 9/2 x 3/4 - 9/4 x 1/3
= 3/8 + 9/2 x 3/4 - 3/4
= 3/8 + (9/2 - 1) x 3/4
= 3/4 x 1/2 + 7/2 x 3/4
= 3/4 x ( 1/2 + 7/2)
= 3/4 x 4
= 3
\(\dfrac{8\times3\times4}{16\times3}=\dfrac{8\times3\times2\times2}{2\times8\times3}=2.\\ \dfrac{30\times25\times7\times8}{75\times8\times12\times14}=\dfrac{5\times2\times3\times5\times5\times7\times8}{3\times5\times5\times8\times2\times2\times3\times2\times7}=\dfrac{5}{12}.\)
a) 8/12 + 9/27 x 4/7
= 2/3 + 1/3 x 4/7
= 2/3 + 4/21
= 18/21
= 6/7
b) 8/16 x 36/45 - 4/25
= 1/2 x 4/5 - 4/25
= 2/5 - 4/25
= 6/25
Bài làm
a ) \(\frac{4.6.8}{6.12.16}\)= \(\frac{4.6.8}{6.4.3.8.2}\)= \(\frac{1}{3.2}\)= \(\frac{1}{6}\)
b ) \(\frac{3.4.5.6}{9.8.10.3}\)= \(\frac{3.4.5.6}{3.3.4.2.5.6}\)= \(\frac{1}{3.2}\)=\(\frac{1}{6}\)
Tính :
a) 4 x 6 x 8 / 6 x 12 x 16=192/1152
b) 3 x 4 x 5 x 6 / 9 x 8 x 10 x 3=360/2160
A = \(\dfrac{8\times12\times32+4\times27\times24+96\times41}{16\times48-48\times9+4\times3\times12}\)
A = \(\dfrac{96\times32+96\times27+96\times41}{16\times48-48\times9+48\times3}\)
A = \(\dfrac{96\times\left(32+27+41\right)}{48\times\left(16-9+3\right)}\)
A = \(\dfrac{96\times100}{48\times10}\)
A = \(\dfrac{20}{1}\) \(\times\) \(\dfrac{48\times10}{48\times10}\)
A = 20
b, 3/5 + 4/7 + 2/8 + 10/25 + 9/21 + 28/16
= 3/5 + 4/7 + 2/8 + 2/5 + 3/7 + 14/8
= (3/5 + 2/5) + ( 4/7 + 3/7) + ( 2/8 + 14/8)
= 1 + 1 + 7/4
= 2 + 7/4 = 15/4
c , 8/7 + 7/6 + 5/8 + 10/12 + 24/28 + 6/16
= c , 8/7 + 7/6 + 5/8 + 5/6 + 6/7 + 1/2
= (8/7 + 6/7) + (7/6 + 5/6) + 5/8 + 1/2
= 14/7 + 12/6 + 5/8 + 1/2
= 2 + 2 + 5/8 + 1/2
= 4 + 9/8 = 41/8
2 nhe ban
đây là bài tính nhanh