Toán Lớp 7: a)8²/⁷ -(3⁴/⁹*4²/⁷) b) (10²/⁹+2³/⁵)-26/19 c) 25%-5/4+1⁵/⁶ d) 45:2⁴/⁷+50%-1,25

Question

Toán Lớp 7:  a)8²/⁷ -(3⁴/⁹*4²/⁷)  b) (10²/⁹+2³/⁵)-26/19 c) 25%-5/4+1⁵/⁶ d) 45:2⁴/⁷+50%-1,25

maianhnhiquynh · Answer

a) 8 frac{2}{7} - (3 frac{4}{9} . 4 frac{2}{7})   &rArr;  frac{58}{7} - (  frac{31}{9} .  frac{30}{7} )   &rArr;  frac{58}{7} -  frac{310}{21}   &rArr; frac{-136}{21}   b) ( 10 frac{2}{9} + 2 frac{3}{5} ) -  frac{26}{19}   &rArr; (  frac{92}{9} +  frac{13}{5} ) -  frac{26}{9}   &rArr;     frac{577}{45} -  frac{26}{9}   &rArr;   frac{447}{45}   c ) 25% -  frac{5}{4} + 1 frac{5}{8}   &rArr;  frac{1}{4} -  frac{5}{4} +  frac{13}{8}   &rArr; -1 +  frac{13}{8}   &rArr;  frac{5}{8}   d) 45 : 2 frac{4}{7} + 50% - 1,25   &rArr; 45 :  frac{18}{7} +  frac{1}{2} -  frac{5}{4}   &rArr;  frac{315}{18} +  frac{1}{2} -  frac{5}{4}   &rArr;  frac{324}{18} -  frac{5}{4}   &rArr;  frac{561}{36}                                     XIN HAY NHẤT