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99.99*0.8.11*2.8谁能帮我解决简便算法,要过程...

99.99*0.8+11.11*2.8 =11.11*(9*0.8)+11.11*2.8 =11.11*7.2+11.11*2.8 =11.11*(7.2+2.8) =11.11*10 =111.1

99.99*0.8+11.11*2.8 =(100-0.01)*0.8+11.11*(3-0.2) =100*0.8-0.01×0.8+11.11*3-11.11*0.2 =80-0.008+33.33-2.222 =111.1

11.11(9x0.8十1x2.8) =11.11(7.2十2.8) =11.11X10 =111.1

原式=2.8×23.4+11.1×8×7.2+65.4×2.8 =2.8×(23.4+65.4)+88.8×7.2 =2.8×88.8+7.2×88.8 =88.8×(2.8+7.2) =88.8×10 =888

你好! 光圈是一个用来控制光线透过镜头,进入机身内感光面的光量的装置,它通常是在镜头内。 表达光圈大小我们是用f值。对于已经制造好的镜头,我们不可能随意改变镜头的直径,但是我们可以通过在镜头内部加入多边形或者圆型,并且面积可变的孔...

=11×5.4 =(10+1)×5.4 =10×5.4+1×5.4 =54+5.4 =59.4

0.99÷18 =0.99÷9÷2 =0.11÷2 =0.055 56÷2.8 =56÷7÷0.4 =8÷0.4 =20 但愿我的回答对你有所帮助, 如果本题有什么不明白可以追问, 如果满意记得采纳!谢谢!>数学辅导团】

①2.5x2.8X4 乘法交换律+乘法结合律 =2.5x4x2.8 =10x2.8 =28 ②4.8X3.6一3.8X3.6 乘法分配律 =3.6x(4.8-3.8) =3.6x1 =3.6 ③(8十0.8)×1.25 乘法分配律 =8x1.25+0.8x1.25 =10+0.1 =10.1 ④7.09X99+7.09 乘法分配律 =7.09x(99+1) =7.09x100 =709

-7.2+6.3-2.8+11.7 =-7.2-2.8+11.7+6.3 =18-10 =8

(1)1.25*6.4*7 =1.25*0.8*8*7 =1*56 =56 (2)9.9*7.8+0.78 =99*0.78+0.78 =0.78*(99+1) =78 (3)0.77/0.55 =0.11*7/0.11*5 =7/5 (4)7.5*1.02 =7.5*(1+0.02) =7.5+7.5*0.02 =7.2+0.15 =7.35 (5)3.7*2.8+12.5 =3.7*(3-0.2)+12.5 =11...

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