急急急`~~~几道简算题`快`

来源：百度知道 编辑：UC知道 时间：2024/05/17 00:07:49
25×1.25×32 45×9.9 4.2×102-8.4
7.86-(5.63-0.86)-1.37
3.6-2.8+7.4-7.2 8/17÷23+1/23×9/17+1/23
(1/2+1/3)÷3/5-17/18
我急啦``拜托快`过程要写噢```快啦快啦``+U~~~我急嗯,,,快快快```谢谢啦哈

25×1.25×32
=25*1.25*4*8
=(25*4)*(1.25*8)
=100*10
=1000

45×9.9
=45*(10-0.1)
=45*10-45*0.1
=45-4.5
=40.5

4.2×102-8.4
=4.2*102-4.2*2
=4.2*(102-2)
=4.2*100
=420

7.86-(5.63-0.86)-1.37
=7.86-5.63+0.86-1.37
=(7.86+0.86)-(5.63+1.37)
=8.72-7
=1.72
3.6-2.8+7.4-7.2
=(3.6+7.4)-(2.8+7.2)
=11-10
=1
8/17÷23+1/23×9/17+1/23
=8/17*1/23+1/23*9/17+1/23
=1/23*(8/17+9/17+1)
=1/23*2
=2/23
(1/2+1/3)÷3/5-17/18
=5/6*5/3-17/18
=25/18-7/18
=18/18
=1

25*4 * 1.25*8
45*10-45*0.1
4.2*102-4.2*2
下一题怀疑你写错加减号了
(7.86+0.86)-(5.63+1.37)
(3.6+7.4)-(2.8+7.2)
8/17 /23 +9/17 /23 +1/23=1/23 + 1/23
(5/6 / 3/5 )- 17/18=25/18 -17/18=4/9