Sửa lại đề là:
\(\sqrt{25}-\sqrt{\frac{4}{9}}\)
\(=5-\frac{2}{3}\)
\(=\frac{13}{3}.\)
Chúc bạn học tốt!
Violympic toán 7
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TG
13 tháng 3 2020 lúc 20:02
Tính giá trị biểu thức sau:
Bleft(18frac{1}{3}:sqrt{225}+8frac{2}{3}.sqrt{frac{49}{4}}right):left[left(12frac{1}{3}+8frac{6}{7}right)-frac{left(sqrt{7}right)^2}{left(3.sqrt{2}right)^2}right]:frac{1704}{445}
Cfrac{left(81,624:4frac{4}{3}-4,505right)^2+125frac{3}{4}}{left{left[left(frac{11}{25}right)^2:0,88+3,53right]^2-left(2,75right)^2right}:frac{13}{25}}
P/s: Giúp mik với ạ! Nguyễn Văn Đạt ; @Vũ Minh Tuấn; @Phạm Thị Diệu Huyền; ..........
Đọc tiếp
Tính giá trị biểu thức sau:
\(B=\left(18\frac{1}{3}:\sqrt{225}+8\frac{2}{3}.\sqrt{\frac{49}{4}}\right):\left[\left(12\frac{1}{3}+8\frac{6}{7}\right)-\frac{\left(\sqrt{7}\right)^2}{\left(3.\sqrt{2}\right)^2}\right]:\frac{1704}{445}\)
\(C=\frac{\left(81,624:4\frac{4}{3}-4,505\right)^2+125\frac{3}{4}}{\left\{\left[\left(\frac{11}{25}\right)^2:0,88+3,53\right]^2-\left(2,75\right)^2\right\}:\frac{13}{25}}\)
P/s: Giúp mik với ạ! Nguyễn Văn Đạt ; @Vũ Minh Tuấn; @Phạm Thị Diệu Huyền; ..........
Thực hiện phép tính: \(\frac{4^5.9^4-2.6^9}{2^{10}.3^8+6^8.20}:\sqrt{\frac{25}{9}}\)
1.thực hiện phép tính
a.(0,125).(-3.7).(-2)\(^3\)
b.\(\sqrt{36}.\sqrt{\frac{25}{16}}+\frac{1}{4}\)
c.\(\sqrt{\frac{4}{81}}:\sqrt{\frac{25}{81}}-1^2_5\)
d.\(0,1.\sqrt{225}.\sqrt{\frac{1}{4}}\)
Thực hiện phép tính sau
a. F=[12(1)-2,3(6)]:4,(21)
b.\(\frac{1\frac{11}{34}.4\frac{3}{7}-\left(\frac{3}{2}-6\frac{1}{3}.\frac{2}{19}\right)}{4\frac{5}{6}+\frac{1}{6}.\left(12-5\frac{1}{3}\right)}\)
c.1-\(\frac{\sqrt{121}}{\sqrt{196}}-\frac{\sqrt{169}}{\sqrt{144}}+\frac{\sqrt{25}}{\sqrt{36}}+\left(-1\frac{2}{3}\right):\left(-3\frac{1}{3}\right)\)
1 tính
a, \(\sqrt{0,36}+\sqrt{0,49}\)
b, \(\sqrt{\frac{4}{9}}-\sqrt{\frac{25}{36}}\)
2 tìm x
a, \(x^2=81\)
b, \(\left(x-1\right)^2=\frac{9}{16}\)
c, \(x-2\sqrt{x}=0\)
d, \(x=\sqrt{x}\)
Tính
a) \(2\sqrt{\dfrac{25}{16}}-3\sqrt{\dfrac{49}{36}}+4\sqrt{\dfrac{81}{64}}\)
b) \(\left(3\sqrt{2}\right)^2-\left(4\sqrt{\dfrac{1}{2}}\right)^2+\dfrac{1}{16}.\left(\sqrt{\dfrac{3}{4}}\right)^2\)
c) \(\dfrac{2}{3}\sqrt{\dfrac{81}{16}}-\dfrac{3}{4}\sqrt{\dfrac{64}{9}}+\dfrac{7}{5}.\sqrt{\dfrac{25}{196}}\)
TÍNH NHANH
a,\(\frac{-2}{5}+\frac{3}{10}+\frac{-3}{5}\)
b, \(9.\left(\frac{-1}{3}\right)^3+\frac{1}{6}.\sqrt{4}\)
c, \(15\frac{1}{4}:\frac{5}{7}-25\frac{1}{4}:\frac{5}{7}\)
a,frac{4^5.9^4-2.6^9}{2^{10}.3^8+6^8.20}
b,frac{27^2.8^5}{6^6.32^3}+frac{3^4.4^4}{2^2.6^2}
c,left(1+frac{1}{1.3}right)left(1+frac{1}{2.4}right)left(1+frac{1}{3.5}right)........left(1+frac{1}{20.22}right)
d,frac{3}{2}+frac{7}{6}+frac{13}{12}+frac{21}{20}+.....+frac{91}{90}
e,left(-2^2right)+sqrt{36}-sqrt{9}+sqrt{25} 20).20)
Đọc tiếp
a,\(\frac{4^5.9^4-2.6^9}{2^{10}.3^8+6^8.20}\)
b,\(\frac{27^2.8^5}{6^6.32^3}+\frac{3^4.4^4}{2^2.6^2}\)
c,\(\left(1+\frac{1}{1.3}\right)\)\(\left(1+\frac{1}{2.4}\right)\)\(\left(1+\frac{1}{3.5}\right)\)........\(\left(1+\frac{1}{20.22}\right)\)
d,\(\frac{3}{2}\)+\(\frac{7}{6}\)+\(\frac{13}{12}+\frac{21}{20}+.....+\frac{91}{90}\)
e,\(\left(-2^2\right)+\sqrt{36}-\sqrt{9}+\sqrt{25}\) 20).20)
Bài 3: Thực hiện phép tính:
a) \(9,2.2\frac{1}{2}.-\left(2.125-1\frac{5}{12}\right):\frac{1}{4}\)
b) \(\frac{\sqrt{3^2}-\sqrt{39^2}}{\sqrt{59-10-\sqrt{91^2}}}\)
c) \(\frac{5}{18}-1,456:\frac{7}{25}+4,5.\frac{4}{5}\)