... -2,853b.(-3 ,7) . (-2,16) = + (3 ,7. 2,16) = 7, 992Bài 18(Sgk - 15)a) -5, 17 - 0,469 = - (5, 17 + 0,469) = - 5,639b) - 2,05 +1 ,73 = - (2,05 - 1 ,73 ) = - 0,32c) (-5, 17) .(-3,1) = (5, 17. 3,1) = 16,0 27 d) (-9,18) ... 26a-= = =- - -2,04 204 17 ,3,12 312 26b-= = =- - -23 16, 4 :4 23 73 73 73 14, : . 2 7 14 7 73cd= == = =Bài 60(SGK - 31) Tìm x:1 2 7 2, . :3 3 4 51 2 7 5. .3 3 4 235 1 35 ... 3,15 = 2 ,77 b,=[(-20,83 - 9, 17) . 0,2] : [(2, 47 + 3,53) .0,5] =[(-30) . 0,2] : [6 . 0,5]=- 6:3 =-2Bài 26: (Sgk - 16)a,-5,54 97 b,-0,42Bài 22: (Sgk - 16)1033,0 =;8 7 1000 875 875 ,0==1343,0065 875 ,03211341030658 7 3211341304013039103658 7 652420242138 7 <<<<<<<<<<=>=<=<=>=>= hay Bài...