3/(3/4)²:(5/4)²+14,7-1+9/25 (do hỗn số mình ko để đc nên mình để 1+9/25) nha
=9/16:25/16+14,7-34/25
=(9/16+25/16)+147/10-34/25
=(34/16:34/25)+147/10-34/25
=(34/16.25/34)+ " ------>lười ghi lại
=16/25+ "
=(16/25+34/25)-147/10
=50/25- "
=-127/10
3/1,25.3/7+5/4.(-1/7)
=5/4.3/7+5/4.(-1/7)
=5/4.[3/7+(-1/7)]
=5/4.2/7
=5/14
4/(2/3+7/15):(2/3-3/5)²
= " : (2/3)²-(3/5)²
= (2/3-4/9 ) : 7/15+(3/5)²
=0 : 7/15+9/25
= 0 (vì số nào chia với 0 cũng bằng 0)
5/23+1/3÷(-5/7)-13+1/3÷(-5/7)
=(23-13)÷[(-5/7)+1/3]
=10÷(-8/21)
=-105/4
=-26,25
cho xin CTLHN
