( )可以填那些数?5×( )<25,( )里可以填
(1)1125﹣997 (2)12﹣(1+2) (3)(﹣)×12 (4)4.35+4.25+3.65+3.75 (5)17﹣3﹣4 (6)22.3﹣2.45﹣5.3﹣4.55 (7)187.7×11﹣187.7 (8)998+1246 (9)400÷125÷8 (10)1×2× (11)34×(2+) (12)3.4×99+3.4 (13)÷2+× (14)(++)×72 (15)43×+57.125×﹣0.5 (16)4+3.2+5+6.8 (17)25×(37×8) (18)125×8.8 (19)17.15﹣8.47﹣1.53 (20)0.125×0.25×32 (21)4.25﹣3﹣(2﹣1) (22)2.42÷+4.58×﹣4÷3.
简便计算:1000÷32÷0.25÷1.25 166× 2×3×5÷(3.35×5.625×2.12)
直接写得数.1﹣+= 1÷×= 0.5﹣+0.5﹣=1+= (+)×24= 7÷×7÷=8.1﹣0.9= 72÷0.4= 1.25×8=
计算下面各题,能简算的要简算. (1)(+)×15 (2)×+× (3)××(4)2.5×97×0.4 (5)1.25×97×8 (6)1.25×32×2.5×97 (7)0.36×101 (8)0.36×98 (9)﹣×(10)+× (11)+× (12)﹣×(13)90× (14)86× (15)×﹣×(16)0.36×101﹣0.36 (17)0.36×99+0.36 (18)×﹣.
计算:4×25+24×5= 125×32= ﹣=+75%= 4π×25%= +×32=