Question

这4道题怎么做，求大神解答

这4道题怎么做，求大神解答能简便算法的就简便

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Answer 1

7/25×4/9+7/25×5/9
=7/25×(4/9+5/9)
=7/25×1
=7/25

60×(1/12+1/15+1/4)
=60×1/12+60×1/15+60×1/4
=5+4+15
=24

(5/12-3/8)×72
=5/12×72-3/8×72
=30-27
=3

6/7-5/24÷7/12
=6/7-5/24×12/7
=12/14-5/14
=7/14
=1/2

2/3-7/8+1/3
=(2/3+1/3)-7/8
=1-7/8
=1/8

5/6-(3/7-1/6)
=(5/6+1/6)-3/7
=1-3/7
=4/7

1-1/3-2/3
=1-(1/3+2/3)
=1-1
=0

1+3/5-1/10
=1+6/10-1/10
=1+1/2
=1又1/2

3/8-12/13+5/8
=3/8+5/8-12/13
=1-12/13
=1/13

1-(1/2-3/4)
=1+3/4-2/4
=1+1/4
=5/4

1-1/2-1/4
=1/2-1/4
=2/4-1/4
=1/4

2-1/4-3/4
=2-(1/4+3/4)
=2-1
=1

1/2-(3/8-1/2)
=1/2+1/2-3/4
=1-3/8
=5/8

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

2.7×5.7-2.7+5.3×2.7
=2.7×(5.7-1+5.3)
=2.7×10
=27

0.625÷0.125×0.8
=(0.625×0.8)×8÷(0.125×8)
=0.5×8÷1
=4

18.6×6.1+3.9×18.6
=18.6×(6.1+3.9)
=18.6×10
=186

0.92x15+0.08x15
=(0.92+0.08)×15
=1×15
=15

0.72×1.25×2.5
=0.9×(0.8×1.25)×2.5
=0.9×1×2.5
=2.25

400.6x7-2003x0.4
=200.3x14-200.3x4
=200.3×（14-4）
=200.3×10
=2003

300÷125÷8
=300÷(125×8)
=300÷1000
=0.3

396-96-172-28
=(396-96)-(172+28)
=300-200
=100

125x24
=125x8x3
=1000x3
=3000

26x15
=(20+6)x15
=20x15+6x15
=300+90
=390

25x99x4
=25x4x99
=100x99
=9900

250x32
=250x4x8
=1000x8
=8000

(98+98+98+98)x25
=4x98x25
=4x25x98
=100x98
=9800

3/4÷5/8×3/10
=3/4×8/5×3/10
=9/5×1/5
=9/25

1.25×(8+10)
=1.25×8+1.25×10
=10+12.5
=22.5

1.24+0.78+8.76
=(1.24+8.76)+0.78
=10+0.78
=10.78

1/2-(4/5-1/2)
=1/2+1/2-4/5
=1-4/5
=1/5

4800÷25÷4
=4800÷(25x4)
=4800÷100
=4800÷100
=48

2/5-(3/8-3/5)
=2/5+3/5-3/8
=1-3/8
=5/8

3/4-(3/7-1/4)
=3/4+1/4-3/7
=1-3/7
=4/7

3.2x0.125x2.5
=0.125x8x(0.4x2.5)
=1x1
=1

0.4×125×25×0.8
=(0.4×25)×(125×0.8)
=10×100
=1000
1/2-(4/5-1/2)
=1/2+1/2-4/5
=1-4/5
=1/5

4800÷25÷4
=4800÷(25x4)
=4800÷100
=4800÷100
=48

2/5-(3/8-3/5)
=2/5+3/5-3/8
=1-3/8
=5/8

3/4-(3/7-1/4)
=3/4+1/4-3/7
=1-3/7
=4/7
9/17x8/13+8/13/(17/8)
=9/17x8/13+8/13x8/17
=8/13x(9/17+8/17)
=8/13x1
=8/13