Question

1、8÷38×5.7+2.5÷3 2、39×（31/56+7/22）+17×（31/56-7/22） （写出过程）

Answer 1

8÷38×5.7+2.5÷3
＝4/19x5.7+5/2x1/轮磨3
=1.2+5/6
=6/5+5/6
=36/30+25/30
=61/30

39×（31/56+7/22）+17×（31/56-7/22）旅轿
=39x31/56+39x7/22+17x31/拆桐肆56-17x7/22
=(39+17)x31/56+(39-17)x7/22
=56x31/56+22x7/22
=31+22
=53

Answer 2

8÷38×5.7+2.5÷3=(8/38)*(57/100)+5/6=6/5+5/6=61/30
39×（31/56+7/22）并纤漏+17×（竖巧31/56-7/22）
=(39+17)×（31/56)+(39-17)*7/绝烂22
=31+7=38