递等式计算怎么算!
望采纳
解答如下:
(1) 18.65-9.28+11.25-0.72
=(18.65+11.25)-(9.28+0.72)
=27.9-10=17.9
(2) 1÷4÷2.5
=1÷(4×2.5)=1÷10=0.1
(3) 9.6×6.9+0.96×31
=9.6×6.9+9.6×3.1
=9.6×(6.9+3.1)
=9.6×10=96
(4) 11.258÷(9.06-0.76÷1.9)
=11.258÷(9.06-0.4)
=11.258÷8.66
=1.3
1÷4÷2.5
=1÷(4×2.5)
=1÷10
=0.1