30道简算题六年级上册及答案
1、
2.×1.7-2.×0.7
=2.×(1.7-0.7)
=2.×1
=2.
2、
31.5×1.07-3.15×0.7
=3.15×10.7-3.15×0.7
=3.15×(10.7-0.7)
=3.15×10
=31.5
3、
2.7×5.7-2.7+5.3×2.7
=2.7×(5.7-1+5.3)
=2.7×10
=27
4、
0.625÷0.125×0.8
=(0.625×0.8)×8÷(0.128×8)
=0.5×8÷1
=4
5、
18.6×6.1+3.9×18.6
=18.6×(6.1+3.9)
=18.6×10
=186
6、
1.3579+3.5791+5.7913+7.9135+9.1357
=(1+3+5+7+9)×1.1111
=25×1.1111
=27.7775
7、
52.5x2.9+5.45
=5.25x29+5.25+0.2
=5.25×(29+1)+0.2
=5.25×30+0.2
=157.5+0.3
=157.7
8、
0.92x15+0.08x15
=(0.92+0.08)×15
=1×15
=15
9、
0.72×1.25×2.5
=0.9×(0.8×1.25)×2.5
=0.9×1×2.5
=2.25
10、
400.6x7-2003x0.4
=200.3x14-200.3x4
=200.3×(14-4)
=200.3×10
=2003
11、
300÷125÷8
=300÷(125×8)
=300÷1000
=0.3
12、
396-96-172-28
=(396-96)-(172+28)
= 300-200
= 100
13、
125×24
= 125×8×3
= 1000×3
= 3000
14、
26×15
= (20+6)×15
= 20×15 + 6×15
= 300+90
=390
15、
25*99*4
= 25*4*99
= 100*99
= 9900
16、
250×32
= 250×4×8
= 1000×8
= 8000
17、
(98+98+98+98)*25
= 98×4×25
=98×(4×25 )
= 98 ×100
= 9800
18、
3/7 × 49/9 - 4/3
=7/3-4/3
=1
19、
8/9 ×5/12+ 1/27
=10/27+1/27
=11/27
20、
12× 5/6 – 2/9 ×3
=10-2/3
=9又1/3
21、
8× 5/4 + 1/4
=10+1/4
=10又1/4
22、
6÷ 3/8 – 3/8 ÷6
=16-1/16
=15又15/16
23、
4/7 × 5/9 + 3/7 × 5/9
=(4/7+3/7)×5/9
=1×5/9
=5/9
24、
5/2 -( 3/2 + 4/5 )
=5/3-3/2-4/5
=1-4/5
=1/5
25、
7/8 + ( 1/8 + 1/9 =7/8+1/8+1/9
=1+1/9
=1又1/9
26、
9 × 5/6 + 5/6
=(9+1)×5/6
)
=10×5/6
=25/3
27、
3/4 × 8/9 - 1/3
=2/3-1/3
=1/3
28、
(1/2+1/3-1/5)×30
=1/2×30+1/3×30-1/5×30
=15+10-6
=19
29、
5/7×3/25+3/7
=3/35+3/7
=18/35
30、
1/4+3/4×2/3÷2
=1/4+1/2×1/2
=1/4+1/4
=1/2
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