Question

请问这道题怎么写，要简便运算

Answer 1

=1/4x[4.85x18/5 - 3.6 + 6.15x18/5] +[1.75x(1+14/21 + 19/21)+5.5]

=1/4x[0.97x18 - 3.6 +1.23x18]+[1.75x(1+11/7) + 5.5]

【第一部分提取公因数18】

=18/4x[0.97-0.2+1.23]+[1.75+2.75+5.5]

=9/2 x 2 +10

=9 +10

=19

Answer 2

简便算法如下

Answer 3

原式=1/4x[4.85x18/5-3.6+6.15x18/5]+[1.75x(5/3+19/21)+5.5]
=1/4x[0.97x18-3.6+1.23x18]+[1.75x(35/21+19/21)+5.5]
=1/4x[0.97x18-0.2x18+1.23x18]+[1.75x54/21+5.5]
=1/4x18x[0.97-0.2+1.23]+[0.25x54/3+5.5]
=1/4x18x2+[0.25x18+5.5]
=9+10
=19