7.53.1/2510036.56.2+280.365+3.65999.9*599.9+199.99

来源：学生作业帮助网编辑：作业帮时间：2024/05/04 16:13:02

7.5*3.1/25*10036.5*6.2+28*0.365+3.65999.9*599.9+199.99
7.5*3.1/25*100
36.5*6.2+28*0.365+3.65
999.9*599.9+199.99

7.5*3.1/25*10036.5*6.2+28*0.365+3.65999.9*599.9+199.99
1、 7.5*3.1/2.5*100
=7.5/2.5*3.1*100
=3*3100
=9300
2、36.5*6.2+28*0.365+3.65
=36.5*6.2+2.8*3.65+3.65
=3.65*（6.2+2.8+1）
=3.65*1.
=36.5
3、999.9*599.9+199.9
=1000×599+0.1×599.9+200-0.1
=5990+59.9+200-0.1
=6049.9+200-0.1
=6249.9-0.1
=6249.8
999.9*599.9+199.9
=(1000-0.1)*599.9+(200-0.1)
=1000*599.9-0.1*599.9+200-0.1
=599900-599.99+200-0.1
=599900-(600-0.1)+200-0.1
=599900-600+0.1+200-0.1
=599900-600+200
=599500
999.9X599.9+199.9
=(1000-0.1)X599.9+(200-0.1)
=1000X599.9-0.1X599.9+200-0.1
=599900-59.99+200-0.1
=599900-(60-0.01)+200-0.1
=599900-60+0.01+200-0.1
=599900+200+0.01-60-0.1
=600039.91
999.9×599.9+199.9
= （1000－0．1）×599.9+199.9
＝1000×599.9－0.1×599.9+199.9
＝599900－59.9+199.9
＝599900＋140
＝60040
自己看一下哪个对吧,看我那么辛苦,给分吧~

7.5*3.1/25*10036.5*6.2+28*0.365+3.65999.9*599.9+199.99 7.5*2.3+2.5*3.1怎么简算呀 7.5×2.37+25×0.189 (7.5-1.5*三分之二)/25% 7.5乘以3.1除以2.5乘以100简便计算铣刀规格：Ф1.2*7.5*4*Ф3.2*25*6T 其中4和6T 3.1×6与6×3.1表示的意义是否相同 5*6-0.5x=25这道方程怎么解5*6-0.5x=25、3.1*6+4.2x=31. 如果2x+9=25,那么6x+7.5x=（）填空如果2x+9=25,那么6x+7.5x=（）填空 7.5吨比()吨多25% 4.7-(-8.9)-7.5+(-6) 7.5×7.5×6怎么简算直接写出X的值8x+4=32 (x+3)除以6=9 80-0.5x=25 38+2x=60 2.5x-2.5=7.5 2(1.2+x)=3.4 40x-0.9=3.1 9x-36=117 4.5x-x=3.5 0.5x+1.05=2x除以19+15=45 x除以94-45=55 12x+24x=12.6 3(x-30)=180 8x+25=1254.6x=9.2 5x-4.2=5.8一楼的你的答案是很好（-7.5）乘（+25）乘（-0.04）（7/12-5/6+1）乘（-24）计算：4.7-(+8.9)-|-7.5|-|+6| 36×25%＋3.6×7.5简便计算 0.36*7.5+0.036*25怎样简便计算