Thuc hien phep tinh :
\(\frac{3^8.16^2}{12^4.8^3}\)
thuc hien phep tinh :
\(\frac{36^4.36^3}{6^{12}}\)
\(\frac{36^4.36^3}{6^{12}}=\frac{36^{4+3}}{\left(6^2\right)^6}=\frac{36^7}{36^6}=36.\)
36^4.36^3 / 6^12
=36^7 / 6^12
=6^7 . 6^7 / 6^7 . 6^5
=6^5 . 6^2 / 6^5 (loại ở tử và mẫu 6^7)
=6^2 (loại ở tử và mẫu 6 ^5 )
=36
.
thuc hien phep tinh:
\(\frac{-1}{12}\)-(\(2\frac{5}{8}\)-\(\frac{1}{3}\))
\(\frac{-1}{12}-\left(2\frac{5}{8}-\frac{1}{3}\right)\)
\(=\frac{-1}{12}-\left(\frac{21}{8}-\frac{1}{3}\right)\)
\(=\frac{-1}{12}-\left(\frac{63}{24}-\frac{8}{24}\right)\)
\(=\frac{-1}{12}-\frac{55}{24}\)
\(=\frac{-2}{24}-\frac{55}{24}\)
\(=\frac{-19}{8}\)
Thuc hien phep tinh(nhanhneu co the)
\(\frac{2^{19}.27^3+15.4^9.9^4}{6^9.2^{10}+12^{10}}\)
\(\frac{2^{19}.27^3+15.4^9.9^4}{6^9.2^{10}+12^{10}}\)
\(=\frac{2^{19}.3^9+3.5.2^{18}.3^8}{2^9.3^9.2^{10}+2^{20}.3^{10}}\)
\(=\frac{2^{19}.3^9+2^{18}.3^9.5}{2^{19}.3^9+2^{19}.2.3^9.3}\)
\(=\frac{2^{18}.3^9.\left(2+5\right)}{2^{19}.3^9.\left(1+6\right)}\)
\(=\frac{7}{2.7}\)
\(=\frac{1}{2}\)
1/4 - 1/3+ 5/12 Thuc hien cac phep tinh (tinh hop li neu co the)
\(\dfrac{1}{4}-\dfrac{1}{3}+\dfrac{5}{12}\\ =\dfrac{3}{12}-\dfrac{4}{12}+\dfrac{5}{12}\\ =\dfrac{3-4+5}{12}\\ =\dfrac{4}{12}\\ =\dfrac{1}{3}\)
Thuc hien phep tinh :
\(\frac{15^3+5.15^2-5^3}{18^3+6.18^2-6^3}\)
15^3+5.15^2-5^3 / 18^3+6.18^2-6^3
=3375+5.225-125 /5832+6.324-216
=3375+1125-125 /5832+1944-216
=4500-125 /7826-216
=4375 /7610
=875 /1522
mk ko bt viết phần nên viết phần bằng dấu gạch / nhé.mk cx ko bt đúng hay sai đâu nhé
Thuc hien phep tinh:
B=\(\frac{2+\sqrt{3}}{\sqrt{2}+\sqrt{2+\sqrt{3}}}+\frac{2-\sqrt{3}}{\sqrt{2}-\sqrt{2-\sqrt{3}}}\)
1 thuc hien phep tinh
a] [3/8cong am3/4cong7/12] chia 5/6cong 1/2
a)
\(\left[\frac{3}{8}+\frac{-3}{4}+\frac{7}{12}\right]:\frac{5}{6}+\frac{1}{2}\)
=\(\left[\frac{9}{24}+\frac{-18}{24}+\frac{14}{24}\right]:\frac{5}{6}+\frac{1}{2}\)
=\(\frac{5}{24}:\frac{5}{6}+\frac{1}{2}\)
=\(\frac{5}{24}.\frac{6}{5}+\frac{1}{2}\)
=\(\frac{1}{4}+\frac{1}{2}=\frac{1}{4}+\frac{2}{4}=\frac{3}{4}\)
tk ủng hộ mk nha ạ!!!!!!!!!!!!!
\(\left(\frac{3}{8}+\frac{-3}{4}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\)
\(=\left(\frac{-3}{8}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\)
\(=\frac{5}{24}:\frac{5}{6}+\frac{1}{2}\)
\(=\frac{1}{4}+\frac{1}{2}\)
\(=\frac{3}{4}\)
3/4 nha
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mk nha
tai sao 3+4=12
khong thuc hien phep tinh hay tra loi
Tại vì : 3 + 4 = tam + tứ = tư + tám = 4 + 8 = 12 nha!
Tại vì phép tính sai hoặc do đổi dấu + thành dấu x
Bạn 0 viết dấu ở dỏng chữ cuối nên đọc 0 có ý nghĩa j nên mình trả lời :)
Thuc hien phep tinh :
\(\frac{28^{15}.3^{17}}{84^{16}}\)
\(\frac{28^{15}\cdot3^{17}}{84^{16}}\)
\(=\frac{4^{15}\cdot7^{15}\cdot3^{17}}{4^{16}\cdot7^{16}\cdot3^{16}}\)
\(=\frac{4\cdot1\cdot3}{1\cdot7\cdot1}\)
\(\frac{12}{7}\)