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A=(27+53)+(46+34)+79
A=80+80+79
A=160+79
A=239
B = -377 - (98 - 277)
B=-377-98-277
B=[(-377)+277]-98
B=(-100)-98
B=-198
C= -1,7.2,3 + 1,7.(-3,7) - 1,7.3 - 0,17 : 0,1
C=1,7.(-2.3)+1,7.(-3,7)+1,7.(-3)+1,7
C=1,7.[(-2,3+(-3,7)+(-3)+1]
C=1,7.(-8)
C=-13,6
Còn mái câu kia mk hk pít lm pn th/cảm cho mk nhae
A = 239
B = 556
C = -7.497
D = -8,8
E = 10
chán quá chưa được ai k
k tớ nhé
DÀI QUÁ ĐI
C = (-1,7) . 2,3 + 1,7 . (-3,7) - 1,7 .3 - 0,17 : 0,1
=> C = -1,7 . 2,3 +( -1,7 ) . 3,7 - 1,7 . 3 - 1,7
=> C = -1,7 . ( 2,3 + 3,7 - 3 - 1 )
=> C = -1,7 . 2 = -3,4
=1,7.2,3+1,7.(-3,7)-1,7.3-1,7
=1,7.[2,3+(-3,7)-3-1]
=1,7.(-5,4)
= -9,18
a, \(\frac{\left(2^3\cdot5\cdot7\right)\cdot\left(5^2\cdot7^3\right)}{\left(2\cdot5\cdot7^2\right)^2}=\frac{2\cdot2^2\cdot5^2.5.7.7^2}{2\cdot5\cdot7^2}=\frac{1\cdot2^2\cdot5^2\cdot7^2}{1\cdot1\cdot1}=4900\)
b, \(1,7\cdot2,3+1,7\cdot\left(-3,7\right)-1,7.3-1,7:0,1=1,7\cdot\left(-3,7+2,3-3\right)-1,7:0,1=1,7.\left(-4,4\right)-1,7:0,1=\left(-2,7\right)-17=-19,7\)
a) \(2\dfrac{3}{4}.\left(-0,4\right)-1\dfrac{3}{5}.2,75+\left(-1,2\right):\dfrac{4}{11}\)
= \(2,75.\left(-0,4\right)-\left(1,6\right).\left(2,75\right)+\left(-1,2\right).\dfrac{11}{4}\)
= \(2,75.\left(-0,4\right)-\left(1,6\right).\left(2,75\right)+\left(-1,2\right).\left(2,75\right)\)
= \(2,75.\left\{\left(-0,4\right)-\left(1,6\right)+\left(-1,2\right)\right\}\)
= \(2,75.\left(-3,2\right)\)
= \(-8,8\)
b) \(1,4.\dfrac{15}{49}-\left(\dfrac{4}{5}+\dfrac{2}{3}\right):2\dfrac{1}{5}\)
= \(\dfrac{7}{5}.\dfrac{15}{49}-\left(\dfrac{4}{5}+\dfrac{2}{3}\right):\dfrac{11}{5}\)
= \(\dfrac{7}{5}.\dfrac{15}{49}-\dfrac{22}{15}.\dfrac{5}{11}\)
= \(\dfrac{3}{7}-\dfrac{2}{3}\)
= \(-\dfrac{5}{21}\)
c) \(\left(-3,2\right).\dfrac{15}{64}+\left(0,8-2\dfrac{4}{15}\right):3\dfrac{2}{3}\)
= \(-\dfrac{16}{5}.\dfrac{15}{64}+\left(\dfrac{4}{5}-2\dfrac{4}{15}\right):\dfrac{11}{3}\)
= \(-\dfrac{16}{5}.\dfrac{15}{64}+\left(-\dfrac{22}{15}\right).\dfrac{3}{11}\)
= \(\left(-\dfrac{3}{4}\right)+\left(-\dfrac{2}{5}\right)\)
= \(-\dfrac{23}{20}\)
d) \(0,02.\dfrac{-25}{2}+\dfrac{3}{8}+\left(-2\dfrac{9}{20}\right).\dfrac{2}{7}\)
= \(\dfrac{1}{50}.\dfrac{-25}{2}+\dfrac{3}{8}+\left(-\dfrac{49}{20}\right).\dfrac{2}{7}\)
=\(\left(-\dfrac{1}{4}\right)+\dfrac{3}{8}+\left(-\dfrac{7}{10}\right)\)
= \(\dfrac{1}{8}+\left(-\dfrac{7}{10}=\right)\)
= \(-\dfrac{23}{40}\)
e) \(34\%:\dfrac{51}{16}-3\dfrac{7}{9}.6,5-\left(0,4\right)^2\)
= \(\dfrac{17}{50}.\dfrac{16}{51}-\dfrac{34}{9}.\dfrac{13}{2}-\dfrac{4}{25}\)
= \(\dfrac{8}{75}-\dfrac{221}{9}-\dfrac{4}{15}\)
= \(-\dfrac{5501}{225}\)
Câu a:
25% - 5/4 + 1 5/6
= 1/4 - 5/4 + 11/6
= -1 + 11/6
= - 6/6 + 11/6
= 5/6
Câu b:
75% : 2 1/5 - (0,5)^2.(-7) + 2,5.(7 2/3 - 5 2/3)
= 3/4 : 11/5 + 1/4.7 + 2,5.2
= 3/4 x 5/11 + 7/4 + 5
= 15/44 + 7/4 + 5
= 15/44 + 77/44 + 220/44
= 92/44 + 220/44
= 312/44
= 78/11
a: \(=\dfrac{5\cdot\left(8-6\right)}{10}=\dfrac{5\cdot2}{10}=1\)
b: \(\dfrac{\left(-4\right)^2}{5}=\dfrac{16}{5}\)
\(B=\dfrac{3}{7}-\dfrac{1}{5}-\dfrac{3}{7}=-\dfrac{1}{5}\)
c: \(C=\left(6-2.8\right)\cdot\dfrac{25}{8}-\dfrac{8}{5}\cdot4\)
\(=\dfrac{16}{5}\cdot\dfrac{25}{8}-\dfrac{32}{5}\)
\(=5\cdot2-\dfrac{32}{5}=10-\dfrac{32}{5}=\dfrac{18}{5}\)
d: \(D=\left(\dfrac{-5}{24}+\dfrac{18}{24}+\dfrac{14}{24}\right):\dfrac{-17}{8}\)
\(=\dfrac{27}{24}\cdot\dfrac{-8}{17}=\dfrac{-9}{8}\cdot\dfrac{8}{17}=\dfrac{-9}{17}\)
Bạn hk giỏi Toán thật đấy ^-^
A = 27 + 46 + 79 + 34 + 53 = 239
B = - 377 - (98 - 277)
= - 377 - 98 + 277
= -198
C = - 1,7× 2,3 + 1,7.× (- 3,7) - 1,7×3 - 0,17:0,1
= 1,7. (-2,3 – 3,7 – 3 – 1)
= 1,7 . (-10)
= -17.
D = 234.(−0,4)−135.2,75+(−1,2):411234.(−0,4)−135.2,75+(−1,2):411
=114.−410−85.114+−65.114=114.−410−85.114+−65.114
=114.(−4
a=239
b=-198
c=-17
d=-44/5
e=10
mấy câu này dành cho hs trung bình khá và khá. đã khó đâu
A= (27 + 53) + (46 + 34) + 79
A= 80 + 80 + 79
A = 239
Vay A = 239