Question

小学六年级上册数学题 分数四则混合运算【用简便的方法做】

（1）5/7×53＋1/7×85 （2）6×11/8＋4÷8/11--11/8×5

Answer 1

（1）5/7×53+1/7×85
=5/7×53+5/7×17
=5/7×（53+17）
=5/7×70
=50
（2）6×11/8＋4÷8/11--11/8×5
=6×11/8-11/8×5＋4×11/8
=11/8×(6-5+4)
=55/8

Answer 2

1、
5/7×53+1/7×85
=5/7×53+1/7×(5×17)
=5/7×53+5/7×17
=5/7×(53+17)
=5/7×70
=50
2、6×11/8＋4÷8/11--11/8×5
=6×11/8＋4×11/8--11/8×5
=(6+4-5)×11/8
=5×11/8
=55/8

Answer 3

（1）5/7×53＋1/7×85
=1/7*（5*53+85）
=1/7*350
=50

（2）6×11/8＋4÷8/11--11/8×5
=66/8+44/8-55/8
=（66+44-55）/8
=55/8

Answer 4

5/7*53+1/7*85
=5/7*53+1/7*5*17
=5/7*53+5/7*17
=5/7*(53+17)
=5/7*70
=50
(2)=4*11/8-11/8*5
=11/8*(4-5)
=-11/8

Answer 5

1. 5/7*(53+17)=5/7*70=50
2. 11/8*(6+4-5)=11/8*5=55/8