Môn Toán Lớp 7: 1,(12/3-1/4).(4/5-3/4)2 2,(-1/9)0-22/9.(2/3)2 có 2 ý thou ak giúp me nhak:3

Question

Môn Toán Lớp 7:  1,(1+2/3-1/4).(4/5-3/4)^2 2,(-1/9)^0-22/9.(2/3)^2 có 2 ý thou ak giúp me nhak:3

lanthuhoa · Answer

1 ) ( 1+ 2/3 -1/4 ) . ( 4/5 -3/4 ) ^2   = (12 +8 - 3 ) / 12 . ((16 -15)/20 )^2   =17/12 . ( 1/20)^2   =17/12. 1/400    =17/( 12.400 )=17/4800   2 ) ( - 1/9 )^0- 22/9 . ( 2/3 ) ^2   =  1 - 22/9 . 4/9   = 1- ( 22.4 ) /( 9.9 )   = 1-88/81   = ( 81-88 )/81   =-7/81

tuyethutanhthu · Answer

Giải đáp:    1)   (1+rac{2}{3}-rac{1}{4}).(rac{4}{5}-rac{3}{4})^{2}   =(rac{12}{12}+rac{8}{12}-rac{3}{12}).(rac{16}{20}-rac{15}{20})^{2}   =rac{17}{12}.(rac{1}{20})^{2}   =rac{17}{12}.rac{1}{400}   =rac{17}{4800}   2)   (-rac{1}{9})^{0}-rac{22}{9}.(rac{2}{3})^{2}   =1-rac{22}{9}.rac{4}{9}   =1-rac{88}{81}   =rac{81}{81}-rac{88}{81}   =-rac{7}{81}   ~~~~~~~~~~~~~   (*) &Aacute;p dụng $a^0=1$

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