能简算的简算 49.5÷9+35.1÷7.8 [2.5-8分之31÷{6分之11+0.75]}×17分之30 19.63×99+19.63{7.6-10.5×0.6}×13分之10

49.5÷9+35.1÷7.8
=5.5+4.5
=10
[2.5-8分之31÷{6分之11+0.75]}×17分之30
=[2.5-(24*31/8)÷{24*(11/6+3/4)]}×30/17
=[2.5-31÷{44+18}×30/17
=(2.5-31÷62)×30/17
=[2.5-0.5}×30/17
=2×30/17
=60/17
19.63×99+19.63
= 19.63×(99+1)
= 19.63×100
=1963
{7.6-10.5×0.6}×13分之10
={7.6-6.3}×10/13
=1.3×10/13
=1

能简算的简算 49.5÷9+35.1÷7.8 [2.5-8分之31÷{6分之11+0.75]}×17分之30 19.63×99+19.63
你这题目好像抄错了吧17分之30 19.63×99+19.63

49.5÷9+35.1÷7.8 =5.5+4.5=10[2.5-8分之31÷{6分之11+0.75]}×17分之30 =（2.5-31/8*12/31）*30/17=（2.5-1.5）*30/17=1*30/17=30/1719.63×99+19.63=19.63*（99+1）=19.63*100=1963{7.6-10.5×0.6}×13分之10=（7...