能简算的要简算

能简算的要简算

（6又1/4×5.43+4.57×6.25）÷25
=6又1/4×（5.43+4.57）×1/25
=25/4×1/25×10
=5/2
=2又1/2
（1又11/24+13/36）×1.44-8/15×0.5625
=35/24×1.44+13/36×1.44-8/15×0.5625
=2.1+0.52-0.3
=2.32
8.1÷[（4又1/7-0.005×700）÷1又2/7]
=8.1÷[（29/7-3.5）×7/9]
=8.1÷[29/7×7/9-7/2×7/9]
=8.1÷[29/9-1/18]
=8.1÷57/18
=243/85
=2又73/85
[1.9+1又9/10×（4.8-3.8）]÷（2又9/10-1.9）
=[1.9+1.9×1]÷1
=3.8÷1
=3.8
[1.9-1.9×（1.9-1.9）]÷3.8
=[1.9-1.9×0]÷3.8
=1.9÷3.8
=0.5
0.54÷（0.8-3/4）+3.45×1又2/5
=0.54÷0.05+3.45×1.4
=10.8+4.83
=15.63