Thực hiện phép tính ( tính nhanh nếu có )
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Câu 1: Thực hiện phép tính (tính nhanh nếu có)
a) \(0,4 \cdot \sqrt{0,25} - \sqrt{\frac{1}{4}}\)
b) \(\left( \frac{2}{7} - \frac{5}{7} \cdot \frac{2}{5} \right)\)
c) \(2^2 \cdot 2^3 \cdot 5^5\)
d) \(\frac{1}{7} - \frac{3}{8} + \frac{13}{8}\)
e) \(3 \cdot \sqrt{16} - \frac{3}{2}\)
f) \(3^2 \cdot \frac{1}{4} - 1 \cdot \sqrt{81}\)
g) \(\left( \frac{3}{4} + \frac{2}{3} \right) - \left( \frac{1}{3} - \frac{1}{4} \right)\)
h) \(\sqrt{\frac{1}{25}} + \frac{1}{5} + 0,3\)
Câu 2: Tìm x biết:
a) \(x - \frac{3}{5} = \frac{1}{2}\)
b) \(3 \cdot (x - 1) = 2^3 - 1\)
c) \(\frac{5}{6} - \frac{1}{x} = -2\)
d) \((x + 2)^2 = 36\)
e) \(x - 3 = -\frac{7}{7} + \frac{7}{12}\)
f) \((x - 3)^2 = 16\)
g) \(\sqrt{9} : x + \frac{2}{3} = 1\)
h) \(2x - 5 = 3^3 - 2\)
Câu 1: Thực hiện phép tính (tính nhanh nếu có)
a) \(0,4 \cdot \sqrt{0,25} - \sqrt{\frac{1}{4}}\)
b) \(\left( \frac{2}{7} - \frac{5}{7} \cdot \frac{2}{5} \right)\)
c) \(2^2 \cdot 2^3 \cdot 5^5\)
d) \(\frac{1}{7} - \frac{3}{8} + \frac{13}{8}\)
e) \(3 \cdot \sqrt{16} - \frac{3}{2}\)
f) \(3^2 \cdot \frac{1}{4} - 1 \cdot \sqrt{81}\)
g) \(\left( \frac{3}{4} + \frac{2}{3} \right) - \left( \frac{1}{3} - \frac{1}{4} \right)\)
h) \(\sqrt{\frac{1}{25}} + \frac{1}{5} + 0,3\)
Câu 2: Tìm x biết:
a) \(x - \frac{3}{5} = \frac{1}{2}\)
b) \(3 \cdot (x - 1) = 2^3 - 1\)
c) \(\frac{5}{6} - \frac{1}{x} = -2\)
d) \((x + 2)^2 = 36\)
e) \(x - 3 = -\frac{7}{7} + \frac{7}{12}\)
f) \((x - 3)^2 = 16\)
g) \(\sqrt{9} : x + \frac{2}{3} = 1\)
h) \(2x - 5 = 3^3 - 2\)