\(A=\frac{\frac{4}{111}+\frac{4}{123}-\frac{4}{999}}{\frac{2}{111}+\frac{2}{123}-\frac{2}{999}}\)
ND
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\(\frac{4}{\frac{111}{\frac{2}{111}+}}+\frac{4}{\frac{123}{\frac{2}{123}+}}+\frac{4}{\frac{999}{\frac{2}{999}}}\)
\(=\frac{2\left(\frac{2}{111}+\frac{2}{123}+\frac{2}{999}\right)}{\frac{2}{111}+\frac{2}{123}+\frac{2}{999}}\)
\(=2\)
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\(\frac{4}{\frac{111}{\frac{2}{111}+}}+\frac{4}{\frac{123}{\frac{2}{123}+}}-\frac{4}{\frac{999}{\frac{2}{999}}}\)
Sửa đề lại rồi đó hả bạn?!
\(=\frac{4}{111}:\frac{2}{111}+\frac{4}{123}:\frac{2}{123}-\frac{4}{999}:\frac{2}{999}\)
\(=\frac{4}{111}\times\frac{111}{2}+\frac{4}{123}\times\frac{123}{2}-\frac{4}{999}\times\frac{999}{2}\)
\(=2+2-2\)
\(=2\)
:))
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\(CMR:\frac{1}{11-2}=\frac{12}{111-3}=\frac{123}{1111-4}=\frac{1234}{11111-5}\)
Mọi ng giúp mình nha mình K cho!
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khó thế?
tính giá trị :\(Q=\left(\frac{1}{99}+\frac{12}{999}+\frac{123}{999}\right)\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
\(Q=\left(\frac{1}{99}+\frac{12}{999}+\frac{123}{999}\right)\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\text{ }\)
\(Q=\left(\frac{1}{99}+\frac{12}{999}+\frac{123}{999}\right)\left(\frac{3}{6}-\frac{2}{6}-\frac{1}{6}\right)\)
\(Q=\left(\frac{1}{99}+\frac{12}{999}+\frac{123}{999}\right).0\)
\(Q=0\)
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Q=(1/99+12/999+123/999).(1/2-1/3-1/6) =(1/99+12/999+123/999).0 Q=0
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\(Q=\left(\frac{1}{99}+\frac{12}{999}+\frac{123}{999}\right)\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
\(\Leftrightarrow Q=\left(\frac{1}{99}+\frac{12}{999}+\frac{123}{999}\right)\times0\)
\(\Leftrightarrow Q=0\)
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Xem thêm câu trả lời
Tinh gia tri bieu thuc :
\(\left(\frac{1}{99}+\frac{12}{999}+\frac{123}{999}\right)\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
\(\left(\frac{1}{99}+\frac{12}{999}+\frac{123}{999}\right)\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
\(=\left(\frac{1}{99}+\frac{12}{999}+\frac{123}{999}\right).0\)
\(=0\)
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\(\left(\frac{1}{99}+\frac{12}{999}+\frac{123}{9999}\right)\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)=\(\left(\frac{1}{99}+\frac{12}{999}+\frac{123}{9999}\right).0=0\)
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Thực hiện phép tính :
a, \(\frac{5922.6001-69}{5932+6001.5931}\)
b, \(\left(\frac{1}{99}+\frac{12}{999}+\frac{123}{999}+\frac{1234}{99999}\right).\left(\frac{1}{2}_{ }-\frac{1}{3}-\frac{1}{6}\right)\)
tính nhanh:
B=(\(\frac{1}{99}+\frac{12}{999}-\frac{123}{9999}\)).(\(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\))
Ta có: B= (1/99+12/999-123/9999).(1/2-1/3-1/6)
B= (1/99+12/999-123/9999).(3/6-2/6-1/6)
B= (1/99+12/999-123/9999).0
B= 0
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B = (1/99+12/999-123/9999).(1/2-1/3-1/6)
B= (1/99+12/999+123/9999).0
B=0
tk mình nha !
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tính nhanh\(\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)x\left(\frac{1}{99}+\frac{12}{999}+\frac{123}{9999}\right)\)
Tính:
\(\left(\frac{1000}{1}+\frac{999}{2}+\frac{998}{3}+\frac{997}{4}+...+\frac{2}{999}+\frac{1}{1000}\right)\)\(:\)\(\left(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+...+\frac{1}{1000}\right)\)