四题简便计算,能简便就要简算.(7/2+14/3)÷49/9-1.5[2-911.9-8.4×4/3)]÷1.312-1÷4-1/4×7200.8×10%+2.008×490+0.2008×5000

(7/2+14/3)÷49/9-1.5
=7/2*9/49+14/3*9/49-3/2
=9/14+12/14-21/14
=0
12-1÷4-1/4×7=4
[2-911.9-8.4×4/3)]÷1.3
=(-909.9-11.2)/1.3
=-921.1/1.3
=不能整除(题目可能错)
200.8×10%+2.008×490+0.2008×5000
=2008*(0.01+0.49+0.5)
=2008

(7/2+14/3)÷49/9-1.5
=49/6÷49/9-1.5
=1.5-1.5
=0
[2-(11.9-8.4×4/3)]÷1.3
=[2-(11.9-11.2)]÷1.3
=[2-0.7]÷1.3
=1.3÷1.3
=1
12-1÷4-1/4×7
=12-（1/4+7/4）
=12-2
=10
200.8×10%+2.008×490+0.2008×5000
=200.8×0.1+200.8×4.9+200.8×5
=200.8×（0.1+4.9+5）
=200.8×10
=2008

(7/2+14/3)÷49/9-1.5=(1/2+2/3)×7×9/49-1.5=7/6×9/7-1.5=1.5-1.5=0[2-(11.9-8.4×4/3)]÷1.3=[2-(11.9-11.2)]÷1.3=(2-0.7)÷1.3=1.3÷1.3=112-1÷4-1/4×7=12-1/4-7/4=12-(1/4+7/4)=12-2=10200.8×10%+2.008×4...