Thuc hien phep tinh
19. 27+41.81+19.20
thuc hien phep tinh
73 . 35 + 27 . 19 - 20 . 73 + 81 . 27 + 85 . 73
73 . 35 + 27 . 19 - 20 . 73 + 81 . 27 + 85 . 73
= 73 . ( 35 - 20 + 85 ) + 27. ( 19 + 81 )
= 73 . 100 + 27. 100
= ( 73 + 27 ) . 100
= 100 . 100
= 10 000
73. 35+ 27.19- 20. 73+ 81. 27+ 85. 73
= 73.(35+ 85 - 20) + 27.(19+81)
=73.100 +27.100
=100.(27+73)
=100.100
=10000
Tick mìn nha
Bài 1: không thực hiện phép tính, hãy so sánh:
a = 27.58-31
b = 27+58.26
bài 2: 19.27+41.81+19.20
Ko được chê bai người khác nhen
a=27.28-31
a=26.58+58-31
a=26.58+27
vì a=26.58+27 mà b=27+58.26=> a=b
Vậy a=b
bài 2
19.27+41.81+19.20
=19.(27+20)+41.81
=19.(41+6)+41.81
=19.41+19.6+41.81
=41.(19+81)+19.6
=41.100+19.6
=4100+114
=4214
Hoặc bạn chỉ cần tính hẳn ra
thuc hien phep tinh
( 5*4^15*9-4*3^20*8^9) /( 5*2^9*6^19-7*2^29*27^6)
Tách hai dấu ngoặc thành hai vế A và B
Ta có :
A=5.415.99-4.320.89=5.230.318-22.227.320
=229.318(2.5-32)=229.318
B=5.29.619-7.229.276=5.29.219.319-7.229.318
=228.318(5.3-7.2)=228.318
=>A:B=229.318:228:318=2
thuc hien phep tinh:
\(\sqrt{3}.\sqrt{\frac{1}{27}}.\sqrt{5}.\sqrt{20}\)
\(\sqrt{3}.\sqrt{\frac{1}{27}}.\sqrt{5}.\sqrt{20}=\sqrt{3.\frac{1}{27}}.\sqrt{5.20}=\sqrt{\frac{1}{9}}.\sqrt{100}=\frac{1}{3}.10=\frac{10}{3}\)
Thuc hien phep tinh ( tinh nhanh neu co the )
a) 27 . ( 58 - 43 ) + 43 . ( 27 + 58 )
b) 66 . ( 34 - 75 ) - 34 . ( 66 + 75 )
Minh can gap !!!!!!
a , 27 . ( 58 - 43 ) + 43 . ( 27 + 58 ) b . 66 . ( 34 - 75 ) - 34 . ( 66 + 75 )
= 27 . 10 + 43 . 85 = 66 . ( 34 - 75 ) + ( -34 ) . ( 66 + 75 )
= 270 + 3755 = [ 66 . 75 + 66 + 75 ] . 34 . ( - 34 )
= 4025 0
k và kb nếu có thể
khong thuc hien phep tinh hay so sanh A va B
A = 36 x 63 - 27
B = 36 + 63 x 35
thuc hien phep tinh:
a, -3+(-13)
b, (-51).12+12.(-49)
c, 317-12+8+(-217)
d, 25.(27-39)-27.(25-39)
a. -3 + (-13) = -(3 + 13) = -16
b. (-51) . 12 + 12 . (-49)
= 12. (-51 - 49)
= 12 . (-100)
= -1200
c. 317 - 12 + 8 + (-217)
= (317 - 217) + 8 - 12
= 100 -4
= 96
d. 25.(27 - 39) - 27.(25 - 39)
= 25.27 - 25.39 - 27.25 + 27.39
= (25.27 - 27.25) + 27.39 - 25.39
= 0 + 39.(27 - 25)
= 39.2
= 78
Thuc hien phep tinh(nhanhneu co the)
\(\frac{2^{19}.27^3+15.4^9.9^4}{6^9.2^{10}+12^{10}}\)
\(\frac{2^{19}.27^3+15.4^9.9^4}{6^9.2^{10}+12^{10}}\)
\(=\frac{2^{19}.3^9+3.5.2^{18}.3^8}{2^9.3^9.2^{10}+2^{20}.3^{10}}\)
\(=\frac{2^{19}.3^9+2^{18}.3^9.5}{2^{19}.3^9+2^{19}.2.3^9.3}\)
\(=\frac{2^{18}.3^9.\left(2+5\right)}{2^{19}.3^9.\left(1+6\right)}\)
\(=\frac{7}{2.7}\)
\(=\frac{1}{2}\)
Thuc hien phep tinh) A = \(\frac{5.2^{30}.3^{18}-4.3^{20}2^{27}}{5.2^9.2^{19}.3^{19}-7.2^{29}.3^{18}}\)
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