bài 1:
a, (-2frac{1}{5}).(frac{-9}{11}).(-1frac{1}{14}).frac{2}{5}
b, [frac{5}{3}- (-frac{1}{4}): 1frac{1}{5}]: (frac{5}{8}+frac{9}{4})
c,-66. (frac{1}{2}- frac{1}{3}+ frac{1}{11})+124. -37+ 63. (-123)
d, C frac{frac{1}{3}-frac{1}{7}-frac{1}{13}}{frac{2}{3}-frac{2}{7}-frac{2}{13}}. frac{frac{1}{3}-0,25+0,2}{1frac{1}{6}-0,875+0,7}+ frac{6}{7}
e, D (frac{1}{4}-1). (frac{1}{9}-1).(frac{1}{16}-1)....(frac{1}{81}-1).(frac{1}{100}-1)
bài 2:
a, x: (frac{2}{9}-frac{1}{5})frac{8}{16}
b,(2x-1).(2...
Đọc tiếp
bài 1:
a, (-\(2\frac{1}{5}\)).(\(\frac{-9}{11}\)).(-1\(\frac{1}{14}\)).\(\frac{2}{5}\)
b, [\(\frac{5}{3}\)- (-\(\frac{1}{4}\)): 1\(\frac{1}{5}\)]: (\(\frac{5}{8}\)+\(\frac{9}{4}\))
c,-66. (\(\frac{1}{2}\)- \(\frac{1}{3}\)+ \(\frac{1}{11}\))+124. -37+ 63. (-123)
d, C= \(\frac{\frac{1}{3}-\frac{1}{7}-\frac{1}{13}}{\frac{2}{3}-\frac{2}{7}-\frac{2}{13}}\). \(\frac{\frac{1}{3}-0,25+0,2}{1\frac{1}{6}-0,875+0,7}\)+ \(\frac{6}{7}\)
e, D= (\(\frac{1}{4}\)-1). (\(\frac{1}{9}\)-1).(\(\frac{1}{16}\)-1)....(\(\frac{1}{81}\)-1).(\(\frac{1}{100}\)-1)
bài 2:
a, x: (\(\frac{2}{9}\)-\(\frac{1}{5}\))=\(\frac{8}{16}\)
b,(2x-1).(2x+3)=0
c,\(\frac{4-3x}{2x+5}\)=0
d,(x-2). (x+\(\frac{2}{3}\))≥0
e, \(\frac{x-2}{3x+2}\)<0
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