搜搜做题作业网简便运算9.9*99
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/02 11:16:45
99×52=(100-1)×52=100×52-52=5200-52=5148
88*99=88*(100-1)=88*100-88*1=8712
3.78×99+3.78=3.78×（99+1）=3.78×100=378
79*99+79=79(99+1)=7900
27.5*9.9+2.75=27.5*（9.9+0.1）=275
365×99=365×（100-1）=365×100-365=36500-365=36135
27×99=27X（100-27）=27X100-27=2700-27=267349＋49×49=49X（1+49）=49X50=245039×101－39=39X（101-1）=39X100=390
再答：望采纳！再答：再答：这个才对再问：0.81×1.5÷9再答：再答：不客气
=72×(10-0.1)=72×10-72×0.1=720-0.72=712.8
99×41=(100-1)×41=100×41-41=4100-41=4059
99*26=（100-1）*26=2600-26=2574
8.7*9.9=8.7(10-0.1)=87-0.87=86.13
=(10-0.1)*9.9+1.99=99-0.99+1.99=100
71*99=71*(100-1)=71*100-71=7100-71=7029
3.56*99-3.5*9.9=35.6*9.9-3.5*9.9=(35.6-3.5)*9.9=32.1*9.9=32.1*(10-0.1)=321-3.21=317.79
360.1/(10-0.1)再答：=360.1/10-360.1/0.1再答：=36.01-3601
3.73*99=3.73*（100-1）=3.73*100-3.73*1=373-3.73=369.27
47.8*9.9+4.78=4.78*99+4.78=4.78*（99+1）=4.78*100=478