Question

小学数学题。

1.2/7x5/12x14/15
2.6/11x8/17x51x55
3.3/8+3/8x99

要求：1、简便计算
2、有过程
3、格式：2/7x5/12x14/15
=
=

Answer 1

您好：

1.2/7x5/12x14/15
=（2/7x14/15）x5/12
=4/15x5/12
=1/9

2.6/11x8/17x51x55
=(6/11x55)x(8/17x51)
=30x24
=720

3.3/8+3/8x99
=3/8x(99+1)
=3/8x100
=75/2

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Answer 2

1. 2/7x5/12x14/15
=（2/7x14/15）x5/12
=4/15x5/12
=1/9

2. 6/11x8/17x51x55
=(6/11x55)x(8/17x51)
=30x24
=720

3. 3/8+3/8x99
=3/8x(99+1)
=3/8x100
=75/2

Answer 3

2/7x5/12x14/15=2/7x14/15x5/12

=4/15x5/12=1/9

6/11x8/17x51x55=6/11x55x8/17x51=30x24=720

3/8+3/8x99=3/8x(1+99)=3/8x100=37(1/2)

Answer 4

=2/7ⅹ1/6ⅹ7/3
=2ⅹ1/6ⅹ1/3
=1/9

Answer 5

倒着来吧
3: 3/8+3/8*99
=3/8*(1+99)
=3/8*100
=75/4

2:6/11*8/17*51*55
= 6/11*8*3/55
=(6*8*3)/(11*(1+5))
=24/11

1: 2/7*5/12*14/15
=1/7*5/6*14/15
=1