Question

小学数学题求解。（要过程）

Answer 1

7.5×46.7+52.3×7.5+7.5

=7.5×46.7+7.5×52.3+7.5+7.5×1

=7.5×(46.7+52.3+1)

==7.5×100

=750

Answer 2

乘法分配律学了吗？如果学了就可以做了。

Answer 3

1、7.5*46.7+52.3*7.5+7.5
=7.5×46.7+52.3×7.5+7.5×1
=7.5×（46.7+52.3+1）
=7.5×100
=750;

2、9998/9+998/9+98/9+1/3
＝9998/9+998/9+98/9+3/9
=1/9*(9998+998+98+3)
=1/9*(9999+999+99)
=1111+111+11
=1233

3、设S=1/2+1/4+1/8+1/16+1/32+1/64+1/128.①
则2S=1+1/2+1/4+1/8+1/16+1/32+1/64.②
②- ①得S=1-1/128
=127/128

Answer 4

第一题，把7.5x2，结果除以2。
二题，999＋99＋9＋9分之8x3＋9分之3⃣️
三题，（64＋32＋16＋8＋4＋2＋1）除以128

追答

1题7.5x4除以4

Answer 5