Đáp án+Giải thích các bước giải:
`a)3/2- [1/2 ÷ 2 - (-9)^2*1/3]`
`=3/2-(1/2:2-81*1/3)`
`=3/2-(1/4-81/3)`
`=3/2-(-107/4)`
`=113/4`
`b)| -100/123| : [3/4 + 7/12] + 23/123 : [ 9/5 - 7/15 ]`
`=100/123:16/12+12/123:20/15`
`=25/41+23/164`
`=123/164=3/4`
` c)((-5)^32 * 20^43)/((-8)^29 * 125^25)`
`=(5^32 * 20^43)/(8^29 * 125^25)`
`=(5^32*20^43)/(8^29*5^75)`
`=20^43/(8^28*5^43)`
`=(5^43*4^43)/(4^29*2^29*5^43)`
`=4^14/2^29=2^28/2^29`
`=1/2`