简便方法计算：（1/10+1/18+1/30）×45/7

(1)（1/10+1/18+1/30）×45x7
=（9/90+5/90+3/90)*45/7
=(17/90*45/7
=17/14
(2)383 3x4×7.9+79×61 5/8
=(383+3x4)*(8-0.1)+(80-1) *5x8
=3064-38.3+6-0.075+50-0.625
=3081
(3)0.125×2 3x4+1/8×6.25-12.5%
=0.125×2 3x4+0.125×6.25-0.125
=0.125*(5.75+6.25-1)
=0.125*11
=1.375
可以吗?