人教版-数学六年级上册--分数乘除法及其巧算(含答案)

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人教版-数学六年级上册--分数乘除法及其巧算(含答案)

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小学数学六年级上册人教版---分数乘除法及其巧算
1.用简便方法计算。(写出简要的计算过程)
(1) ×12.5× ×8
(2)3.6× +1.4÷
(3)80×
2.脱式计算,能使用简便运算的尽量用简便运算。
①1- ÷ -
②10- ×10+
③ ÷( - )×
④ × + ×
⑤ × + ÷4
⑥ ×[1÷( - )]
3.下面各题怎样简便就怎样算。
(1) ÷ ÷
(2)2.4×( )
(3) × + ÷
(4)5- ÷ -
4.计算下面各题,能简算的要简算。
(1)6÷ + ÷6
(2) ÷[( - )×2]
(3)87×
(4)27× + ×15
5.计算下列各题,能简算的要简算。
①( - + )÷
② × + ÷5
③3.2×1.25÷4
④ ×[ ÷( + )]
⑤1-( ÷ )-
⑥ ×66
6.计算(能简算的要简算)。
(1)( - )×24
(2)
(3)12×8
(4)
7.怎样算简便就怎样算。
(1) + ×
(2)24×( - )
(3)÷[(+)×]
(4) ÷ + ×
8.用递等式计算,能简便的要简便(注意写出主要过程)
(1)24÷( - )
(2) × ×
(3)36× +36×
9.简便计算。
(1)( + )×36
(2) × + ÷
(3)19- ÷ -
10.计算下面各题.
(1)26÷ ÷
(2)1.5÷( + )
(3)1.2÷ +3.8×
(4) ÷(4- - )
11.用你喜欢的方法计算下面各题.
① ×
②3÷( × )
③1- ×
④ ×( )
⑤ × ×
⑥ ×[ ÷( )]
12.递等式计算,能简算的要简算。
①2.4÷( + )
② ×0.375+ ÷
③( - )×54
④0.32×(95.1-82.6)
⑤( + × )÷
⑥ ÷[( + )×2]
13.灵活计算下面各题。
(1) × ÷
(2) ÷[( + )× ]
(3) ×0.375+ ÷
(4)2020×
14.计算下列各题.
① × ×
② ÷( + )
③ ÷ ÷
④ ×( ÷ )
⑤( ﹣ )×
⑥9.9× +
15.计算,能简便的要简算。
(1)18×( + - )
(2)3÷ - ÷3
(3)
(4) ÷[8×( - )]
16.计算,能简便的要简算。
(1) ÷8÷
(2) ÷ ×
(3)( + )×12+
(4) × + ÷
17.用你喜欢的方法计算.
(1) × ÷
(2) ×12÷ ×12
(3)42× +42÷9.
18.下面各题怎样简便就怎样算.
(1)48×( + )
(2)(5﹣ ÷ )×( ﹣ )
(3)40÷( + )×
(4) ÷ + ×
答案解析部分
1.【答案】(1)×12.5××8
=(×)×(12.5×8)
=1×100
=100
(2)3.6×+1.4÷
=3.6×+1.4×
=×(3.6+1.4)
=×5
=7
(3)80×
=(79+1)×
=79×+
=23+
=23
2.【答案】①1- ÷ -
=1- × -
=1- -
=0
②10- ×10+
=10-4+
=6
③ ÷( - )×
= ÷ ×
= × ×
=
④ × + ×
=( + )×
=1×
=
⑤ × + ÷4
= × + ×
= ×( + )
=
⑥ ×[1÷( - )]
= ×[1÷ ]
= ×12
=9
3.【答案】(1) ÷ ÷
= × ×
=
(2)2.4×( )
=2.4× +2.4×
=0.9+1.2
=2.1
(3) × + ÷
= × + ×
=( + )×
=
(4)5- ÷ -
=5- × -
=5- -
=3
4.【答案】(1) =20+
=
(2) ÷[( - )×2]
=
=
=
(3) =
=
=
=
(4) =
=
=
=15
5.【答案】①(-+)÷
=(-+)×36
=×36-×36+×36
=9-6+4
=7
②×+÷5
=×(+)
=×1
=
③3.2×1.25÷4
=(1.25×0.8)×4÷4
=1×4÷4
=1
④×[÷(+)]
=×[÷]

=
⑤1-(÷)-
=1--
=
⑥×66
=×(67-1)
=×67-
=5-
=
6.【答案】(1)=
=18-14
=4
(2)=
=
(3)=
=
=96+9
=105
(4)=
=
=
7.【答案】(1)+×
=+
=
(2)24×(-)
=24×-24×
=20-9
=11
(3)÷[(+)×]
=÷[×]

=
(4)÷+×
=(+)×
=1×
=
8.【答案】(1)24÷(-)
=24÷(-)
=24÷
=24×6
=144
(2)××
=×(×)

=
(3)36×+36×
=36×(+)
=36×1
=36
9.【答案】(1)解:( + )×36
= ×36+ ×36
=27+30
=57
(2)解: × + ÷
= × + ×
= ×( + )
= ×
=1
(3)解:19- ÷ -
=19- × -
=19- -
=19-( + )
=19-
=19-3
=16
10.【答案】(1)26÷×
=26××
=44
(2)1.5÷(+)
=1.5÷
=
(3)1.2÷+3.8×
=(1.2+3.8)×
=5×
=6
(4)÷(4--)
=÷(4-1)
=÷3
=
11.【答案】解:① ×
= ×

②3÷( × )
=3÷
=5
③1- ×
=1﹣

④ ×( )
= × ﹣ ×
= ﹣

⑤ × ×
=( )×
=1×

⑥ ×[ ÷( )]
= ×[ ÷ ]
= ×

12.【答案】①2.4÷( + )
=2.4÷( + )
=2.4÷
=2.4×
=2.88
② ×0.375+ ÷
= × + ×
=( + )×
=2×
=
③( - )×54
= ×54- ×54
=9-5
=4
④0.32×(95.1-82.6)
=0.32×12.5
=4
⑤( + × )÷
=( + )×
= × + ×
= +
=
⑥ ÷[( + )×2]
= ÷[( + )×2]
= ÷( ×2)
= ÷
= ×
=
13.【答案】(1)×÷
=××
=
(2)÷[(+)×]
=÷[×]

=3
(3)×0.375+÷
=(+)×0.375
=2×0.375
=0.75
(4)2020×
=(2019+1)×
=2019×+
=7+
=7
14.【答案】① × ×
= ×

② ÷( + )
= ÷

③ ÷ ÷
= ÷ ÷
=1÷

④ ×( ÷ )
= ×

⑤( ﹣ )×
= ×

⑥9.9× +
=3+
=3
15.【答案】(1)18×(+-)
=18×+18×-18×
=12+27-10
=29
(2)3÷-÷3
=3×-×
=7-
=
(3)11××15+11××15
=22+30
=52
(4)÷[8×(-)]
=÷[8×]

=
16.【答案】(1)=
=
=
(2)=
=
=
(3)=
=
=5+1
=6
(4)=
=
=
=
17.【答案】(1) × ÷
= ÷
=2
(2) ×12÷ ×12
=5÷ ×12
=12×12
=144
(3)42× +42÷9
=42× +42×
=42×( + )
=42×1
=42
18.【答案】(1)48×( + )
=48× +48×
=6+40
=46
(2)(5﹣ ÷ )×( ﹣ )
=(5﹣2)×( ﹣ )
=3×

(3)40÷( + )×
=40÷ ×
=64×
=24
(4) ÷ + ×
= × + ×
=( + )×
=1×

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