灵鹊做题网1.7乘9.9加0.17
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/29 12:10:03
9.9乘6.8加0.68=99x0.68+0.68=0.68x(99+1)=0.68x100=68
再答：包正确
4.87-（2.98+0.87）=4.87-0.87-2.98=4-3+0.02=1.02、6.4乘3.28加4.6乘3.28减3.28,=（6.4+4.6-1）×3.28=10×3.28=32.89
9.9乘9.9加0.99=0.99*10*9.9+0.99=0.99*99+0.99=0.99*(99+1）=0.99*100=99
1.99*9.9+0.099=1.99*9.9+0.01*9.9=(1.99+0.01)*9.9=2*9.9=19.8
6.7*9+9.9*3=6.7*9+3.3*9=(6.7+3.3)*9=10*9=90
①0.25×（10+0.4）=0.25×10+0.25×0.4=2.5+0.1=2.6②8.5×9.9=8.5×(10-0.1)=8.5×10-8.5×0.1=85-0.85=84.15③13.5×4
2.9x9.9+0.99=9.9x2.9+9.9x0.1=9.9x(2.9+0.1)=9.9x3=(10-0.1)x3=30-0.3=29.7
13.5*9.9+6.5*10.1=13.5*(10-0.1)+6.5*(10+0.1)=(13.5+6.5)*10+0.1(6.5-13.5)=200-0.7=199.3
原式=6.18*9.9+6.18*0.1=6.18*（9.9+0.1）=6.18*10=61.8
9.9*4.8+0.48=4.8*(9.9+0.1)=48200.4*20.03-200.3*20.02=200.4*20.03-20.03*200.2=20.03*(200.4-200.2)=20.
7.63*（10-0.1）+0.763=76.3-0.763+0.763
5.8乘5.8加0.58乘42=5.8x5.8+5.8x4.2=5.8x(5.8+4.2)=5.8x10=5836.75乘99加36.75=36.75x(99+1)=36.75x100=367517.
=9.9×（99+1）=9.9×100=990希望我的回答能够帮到你
9.9*5.6+0.56=9.9*0.56*10+0.56=99*0.56+0.56=0.56*(99+1)=0.56*100=56再问：4.4*5.5-44*0.33-0.44*22
5.6✘9.9+99+1
28×221.6﹣28×16=28×﹙221.6-16﹚=28×205.6=5756.85.6×1.7﹢0.5×83=0.5×11.2×1.7+0.5×83=0.5×﹙19.04﹢83﹚=0.5×10
=9.6+9.9x99=4.65x32+2.5x46.5+0.465x430=9.6+(9.9x100)-9.9=46.5x3.2+46.5x2.5+46.5x4.3=9.6+990-9.9=46.5