Question

初一的简便运算。帮帮忙吧。谢了急急急

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 要有过程
第三题是 12又4分之3 ÷1又3分之1 +87.25 × 4分之3

Answer 1

1)9.9×9.9+0.99
=9.9×9.9+9.9×0.1
=9.9(9.9+0.1)
=9.9×10
=99
(2）19.81×0.1+0.5×198.1+0.049×1981
=19.81×0.1+19.81×5+19.81×4.9
=19.81(0.1+5+4.9)
=19.81×10
=198.1
（3）12又4分之3 ÷1又3分之1 +87.25 × 4分之3
=51/4÷4/3+(87×4+1)/4×3/4
=17/16+349×3/16
=1064/16
=66.5

Answer 2

9.9*9.9+0.9
=9.9*(9.9+0.1)
=9.9*10
=99
19.81*0.1+0.5+198.1+0.049*1981
=19.8*0.1+19.81*5+19.81*4.9
=19.81*(0.1+5+4.9)
=19.81*10
=198.1
12 3/4 / 1 1/3﹢87.25*3/4
=12 3/4 *3/4﹢87 1/4*3/4
=(12 3/4﹢87 1/4)*3/4
=100*3/4
=75

Answer 3

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

Answer 4

1）化为（10-0.1）的平方+0.99=100-2+0.01+0.99=99
2）化为19.81*0.1+19.81*5+19.81*4.9=19.81*10=198.1
3）化为51/4*3/4+349/4*3/4=3/4*100=75

Answer 5

(12+3/4)/(1+1/3)+(87+1/4)*3/4=(12+3/4)*3/4+(87+1/4)*3/4=(12+3/4+87+1/4)*3/4=75