Rút gọn:
a) 3.5/8.24 b)2.14/7.8 c) 3.7.11/22.9
d)8 .5- 8 .2/ 16 e)11.4-11/2-13
Rút gọn:
a) 3.5/8.24 b)2.14/7.8 c) 3.7.11/22.9
d)8 .5- 8 .2/ 16 e)11.4-11/2-13
( Các bạn giúp mình nhé...ghi rõ cả cách làm)
\(\frac{3.5}{8.24}=\frac{3.5}{2^3.2^3.3}=\frac{1.5}{8.8.1}=\frac{5}{64}\)
\(\frac{2.14}{7.8}=\frac{2.7.2}{7.2^3}=\frac{1.7}{7.2}=\frac{1}{2}\)
\(\frac{3.7.11}{22.9}=\frac{1.7.11}{11.2.3}=\frac{1.7.1}{1.2.3}=\frac{7}{6}\)
\(\frac{8.5-8.2}{16}=\frac{8\left(5-2\right)}{8.2}=\frac{8.3}{8.2}=\frac{1.3}{1.2}=\frac{3}{2}\)
\(\frac{11.4-11}{2-13}=\frac{11\left(4-1\right)}{-11}=\frac{11.3}{-11}=-3\)
Bài 17 (Sgk Toán 6 Trang 15)
a) 3.5/8.24=3.5:3/8.24:3=5/8.8=5/64.
b) 2.14/7.8=2.2.7/7.2^3=2.7/7.4=1/2.
c) 3.7.11/22.9=3.7.1/12.11.3^2=7/2.3=76.
d) 8.5−8.2/16=(8.5−8.2):8/16:8=5−2/2=32.
e) 11.4−11/2−13=11.4−11/−11=(11.4−11):11/−11:11=4−1/−1=−3/1=-3
Rút gọn:
a) \frac{3900-15}{3120-12}=3120−123900−15=
b) \frac{1620+12}{2025+15}=2025+151620+12=
Rút gọn :
a) \(\dfrac{3.5}{8.24}\)
b) \(\dfrac{2.14}{7.8}\)
c) \(\dfrac{3.7.11}{22.9}\)
d) \(\dfrac{8.5-8.2}{16}\)
e) \(\dfrac{11.4-11}{2-13}\)
rút gọn các phân số sau:
a,\(\dfrac{8.5-8.2}{16}\)
b,\(\dfrac{2.14}{7.8}\)
c\(\dfrac{11.4-11}{2-13}\)
d,\(\dfrac{17.5-17}{3-20}\)
e,\(\dfrac{49+7.49}{49}\)
a. \(\dfrac{8,5-8,2}{16}=\dfrac{0,3}{16}=\dfrac{3}{160}\)
b. \(\dfrac{2\cdot14}{7\cdot8}=\dfrac{1\cdot2}{1\cdot4}=\dfrac{2}{4}=\dfrac{1}{2}\)
c. \(\dfrac{11\cdot4-11}{2-13}=\dfrac{11\left(4-1\right)}{-11}=\dfrac{1\cdot3}{-1}=-3\)
d. \(\dfrac{49+7\cdot49}{49}=\dfrac{49\cdot\left(1+7\right)}{49}=\dfrac{8}{1}=8\)
Rút gọn các phân số sau: -63/72, 20/-140, 3.10/5.24, 3.7.11/22.9, 8.5-8.2/16, 11.4-11/2-13 Giúp mik với
\(\dfrac{-63}{72}=\dfrac{-7}{8}\)
\(\dfrac{20}{-140}=\dfrac{-1}{7}\)
\(\dfrac{3.10}{5.24}=\dfrac{30}{120}=\dfrac{1}{4}\)
\(\dfrac{3.7.11}{22.9}=\dfrac{231}{198}=\dfrac{7}{6}\)
\(\dfrac{8.5-8.2}{16}=\dfrac{24}{16}=\dfrac{3}{2}\)
\(\dfrac{11.4-11}{2-13}=\dfrac{33}{-11}=-3\)
rút gọn đến phân số tối giản
a, 8. 5-8.2
16
b, 11.4-11
2-13
a, \(\frac{8.5-8.2}{16}\)\(=\frac{40-16}{16}=\frac{24}{16}=\frac{3}{2}\)
b, \(\frac{11.4-11}{2-13}=\frac{44-11}{-11}=\frac{33}{-11}=-3\)
Chúc em học tốt!
Thuc hien cac phep tinh sau một cách hợp lí:
a) (10^2 + 11^2 + 12^2) : (13^2 + 14^2)
b) 1.2.3...9-1.2.3...8-1.2.3...7.8^2
c) (3.4.2^16)^2/11.2^13.4^11-16^9
d) 1152 - (374 + 1152) +(-65 + 374)
e) 13-12+11+10-9+8-7-6+5-4+3+2-1
a)(10^2+11^2+12^2):(13^2+14^2) b)1.2.3...9-1.2.3...8-1.2.3...7.8^2 c)(3.4.2)^16/11.2^13.4^11-16^9 d)1152-(374+1152)+(-56+374) e)13-12+11+10-9+8-7-6+5-4+3+2-1 |
Tính rồi rút gọn:
a) \(\dfrac{2}{9}+\dfrac{1}{9}\) b) \(\dfrac{5}{6}+\dfrac{1}{6}\) c) \(\dfrac{11}{8}-\dfrac{5}{8}\) d) \(\dfrac{5}{21}-\dfrac{2}{21}\)
thực hiện các phép tính sau một cách hợp lí:
a,\(\left(10^2+11^2+12^2\right):\left(13^2+14^2\right)\)
b,\(1.2.3...9-1.2.3...8-1.2.3...7.8^2\)
c,\(\frac{\left(3.4.2^{16}\right)^2}{11.2^{13}.4^{11}-16^9}\)
d,1152-(374+1152)+(-65+374)
e,13-12+11+10-9+8-7-6+5-4+3-2-1
a) =\(\left[\left(12+1\right)^2+\left(12+2\right)^2\right]:\left(13^2+14^2\right)\)
=1
b)=(1.2.3....8).(9-1-8)
=(1.2.3....8).0
=0
mik chỉ giải được zậy thôi.
t mik nha.