1/(4.1+4.09)*2.5 17分之14*73+17分之2*14*6 54.2-9分之7+4.8-9分之16
问题描述:
1/(4.1+4.09)*2.5 17分之14*73+17分之2*14*6 54.2-9分之7+4.8-9分之16
答
1/(4.1+4.09)*2.5
=1/(8.19)x5/2
=100/819x5/2
=250/819
17分之14*73+17分之2*14*6
=14/17x73+14/17x12
=14/17x(73+12)
=14/17x85
=70
54.2-9分之7+4.8-9分之16
=(54.2+4.8)-(7/9+16/9)
=60-23/9
=57又4/9
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