分数计算
14212()2 () ()
1.化简:=(1) (2) (3)1 = (4)0.45
() 3 12 () () 18 () 2 () 23 () 3 () 2
=() (4) 2 = 转化: 1= ( )1 (2) = ( )(3)
7 () 6 () 11 () 1 1 1 3 2 () 2 3 () () ()
通分: 1) + = + = (2) + =
2 3 () () () 3 4 12 12 ()
2 3 14 2 × 3×14 ()
约分: 1) × × =
3 4 21 3× 4 × 21 ()
2 8 3 2 () ()
×= (3) 3÷ 9÷ 4= 3×
()()
4 14 4 14 2 ()
(2) × ×2 = × × =
7 12 7 12 1 () 2 8 1 8 9 () ()
× ×()=()(4) 2 1 = 383 9 5
2464
2.(1)
23 8 22
4 27
2 (2)
9 8 2 12 9
(3)
3 18 24
1 20 1
3 (4) 3
3 9 5
4 21 3
(5)
7 8 2 5 12 5
(6)
6 15 9
3.(1) 4 1 5 2 5 1
3 5 2
2 2 5 9 1 4 3 10 (2) + + + (3) + + +
7 11 7 11 2 14 2 14
1 5 5 8 1 8 2 2 3 1
(5) ( × )÷( × ) (6)( × )÷( ÷7) (4) × ÷
3 9 6 17 16 17 16 5 5 7
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4.(1) 3 ÷3+ 1
4
5
8 15 1
(2) × - ÷4
15 16 10 2 3 1 1
(3) 1 × - ÷
3 10 10 5
1 8 1 1
(4) 1 × + ÷
4 10 10 40
3 8 1 1
(5)1 × + ÷
4 21 30 10 6 25 1 1
(6) × - ÷
5 24 8 10
5.(1) 8 ×[ 3 -( 7 - 1 )]
9
4 16 4
2 4 1 7 (2) +( + )×
3 7 2 25
4 1 1 3
( )( 15 ) 24 (3)
15 5 6 8
2 3 2 ÷ 4
(4) 6 × 2 -2
5 4 5 11
(5)
5 5
1 ÷ 3
5
1 ÷ 18
5 5 2
54126.(1) 1 23 × 9 + 9 ÷
5
(2) 2 × 3 + 3 × 8
17 18 17 9 (3) 2 ×(31+1 1 )
15 14
4 6 9 2 13
(4)1 5 ×1 7 + 5 ÷1 5 + 35
3 4
(5)1.25×10 5 +3÷ 5 +26.4×1.25
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7.(1)3 1 -1.625
12
2
(2)3.8+1 3 +6.2+3
14 7 3
(3)2.5× ×0.4
7
1
(4)2.1+7÷(3 -1.625)
12
1
(5)0.25+1 ÷2.4
15 2
(6)(2.5-1 )÷3.75
3
8.(1)(3.4-2 2 )×1 2
3 3
5 1 1 3
(2) 1.375+2 —2 (4)1.6-1.6×(2 - ×3)
12 6 2 4
1
(3)1 ÷80%
5
1 1 2
(5)(0.68+3.72÷1 -68%)× (6)9.6-(5 -1.4)
20 2 9
9.(1)1.75× 5 + 4 ×1 3
9
9 4
5 2
(2)(3.6+1 )×11
7 3
7 1
(3)2 ÷0.5-1 ×0.75
10 3
8
(4) 0.2×(2.6+2.7× )
9
1
(5)(1.4+ )÷1.12
3
(6)(
7 1
-0.25)÷ 16 2
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10.(1)21 2 3-(17.6+
2.05)
(3)4.2×( 1
4-0.1÷2)
(5)2 1 8-0.125+1
11.
12.(1)(1.88+2 3
25 )×0.125
(3)1 5
7-(0.6+2.4÷2 2
3 )
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(2) 11 3
4-1.175×10
(4)3.4-2 2 3
3×
4
(6)4.92+6 2
7 +2.08+45
7
-1.75×(1 2
+19 3)
21
(1.625
- 2
3)×5.25
(2)5.5 (4)学习-----好资料
1 9
(5)(8.1×2 - )÷3.6
3 10
3 4 1
(6)(3.91+3 +6.09+6 )×(2 -1.125)
7 7 8
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