简便运算 2- 3/8除以7/17-1/7 5/12除以8+18*7/12 3/8除以【(1/2+1/3)*3/30】
问题描述:
简便运算 2- 3/8除以7/17-1/7 5/12除以8+18*7/12 3/8除以【(1/2+1/3)*3/30】
答
no
答
2- 3/8÷7/17-1/7
=2-3/8×17/7-1/7
=2-51/56-1/7
=53/56
5/12÷8+18×7/12
=5/12×8+8×7/12+10×7/12
=8+35/6
=13又5/6
3/8÷[(1/2+1/3)×3/30]
=3/8÷(5/6×3/30)
=3/8÷1/12
=3/8×12
=9/2
答
2- 3/8÷7/17-1/7 =2-3/8×17/7-1/7=2-51/56-1/7=53/565/12÷8+18×7/12 =5/12×8+8×7/12+10×7/12=8+35/6=13又5/63/8÷【(1/2+1/3)×3/30】=3/8÷(5/6×3/30)=3/8÷1/12=3/8×12=9/2