简便计算.(要写出简算过程)(1)4.05﹣2.86﹣0.14 (2)75×60%+24×+0 6 (3)45×.
直接写得数.×15= ÷3= ÷= 6×=72÷= ÷3= 2×= ××10=
20×=÷=
24×= 15÷= ×= ÷=1÷25%= += 3×÷3×50%= (1﹣1%)÷99%=
直接写得数×8 × 81÷ ÷63÷ ×× 3×÷3× 36×25%
直接写得数.= = = =8×3.14= = 1÷75%= =