Question

分数简便运算怎么做?以下是具体例题,请说明下过程，明天就考试了，急啊！

7.816×1.45+1.69×7.816+3.14×2.184

6又1/9÷【7.125-2×（1-0.875）】

【1.1×20.83-（12.83-8）×1.1】÷（2/3+1/4)

12又5/9×1又3/7+3又2/9×1又3/7-1又3/7×2又1/9-2/3×1又3/7

166又1/20÷41

Answer 1

7.816×1.45+1.69×7.816+3.14×2.184
=7.816x(1.45+1.69)+3.14x2.184
=7.816x3.14+3.14x2.184
=3.14x(7.816+2.184)
=3.14x10=31.4

6又1/9÷【7.125-2×（1-0.875）】
=55/9÷(57/8-2/8)
=55/9÷55/8
=55/9x8/55=8/9
【1.1×20.83-（12.83-8）×1.1】÷（2/3+1/4)
=[1.1x(20.83-12.83)]÷(2/3+1/4)
=(1.1x8)÷(11/12)
=8.8x12/11
=0.8x12
=9.6

12又5/9×1又3/7+3又2/9×1又3/7-1又3/7×2又1/9-2/3×1又3/7
=113/9x10/7+29/9x10/7-10/7x19/9-2/3x10/7
=10/7x(113/9+29/9-19/9-2/3)
=10/7x(113/9+29/9-19/9-6/9
=10/7x117/9
=10/7x13
=130/7

166又1/20÷41
=3321/20÷41
=81/20

Answer 2

你去哪里考试？