1)9.9×9.9+0.99(2）19.81×0.1+0.5×198.1+0.049×1981（3）1112---/1---+87.25×434分之3第三题是12又4分之3÷1又3分之1+87.25×4分之3

Question

1)9.9×9.9+0.99 (2）19.81×0.1+0.5×198.1+0.049×1981 （3） 1 1
12 --- / 1--- +87.25 ×
4 3 4分之3
第三题是 12又4分之3 ÷1又3分之1 +87.25 × 4分之3

Answer 1

9.9*9.9+0.99=0.99*(1+99)=99 19.81*0.1+0.5*198.1+0.049*1981=19.81*(0.1+5+4.9)=198.1