1.9+0.8怎么算纵横比

施往鱼3906用简便方法计算.6.45*102 0.47*0.5*0.8 0.46*1.9+0.54*1.9 0.027+9.9*0.27 15.8*69.3 - 68.3 -
喻詹泄19413083188 ______ (1)6.45*102,=6.45*100+6.45*2,=645+12.9,=657.9;(2)0.47*0.5*0.8,=0.47*(0.5*0.8),=0.47*0.4,=0.188;(3)0.46*1.9+0.54*1.9,=(0.46+0.54)*1.9,=1*1.9,=1.9;(4)0.027+9.9*0.27,=0.027+990.027,=0.027*(99+1),=0.027*100,=2.7;(5)15.8*69.3-68.3*15.8,=15.8*(69.3-68.3),=15.8*1,=15.8;(6)1.25*32*2.5.=(1.25*8)*(4*2.5),=10*10,=100.

施往鱼39064.6*0.8+0.2*7.6简便计算过程 -
喻詹泄19413083188 ______ 解:原式=4.6x0.8+0.8x1.9 =0.8x(4.6+1.9) =0.8x6.5 =5.2 分析:主要考查拆分法和提取公因式的简便方法.

施往鱼3906脱式计算( - 0.8)+1.2+( - 0.7) - (+2.1) - ( - 0.8)+(+3.5) -
喻詹泄19413083188 ______ 脱式计算(-0.8)+1.2+(-0.7)-(+2.1)-(-0.8)+(+3.5)=(-0.8+0.8)+(1.2-0.7)+(3.5-2.1)=0+0.5+1.4=1.9

施往鱼390650.4✘1.9 - 0.8 简便计算 -
喻詹泄19413083188 ______ 解:原式=50.4*2-50.4*0.1-0.8 =50*2+0.4*2-50.4*0.1-0.8 =100+0.8-5.04-0.894.96

施往鱼39067.8ⅹ0.81+1.9ⅹ0.7用简便计算怎么算? -
喻詹泄19413083188 ______ 7.8ⅹ0.81+1.9ⅹ0.7用简便计算怎么算?解:7.8ⅹ0.81+1.9ⅹ0.7=7.8ⅹ(0.8+0.01)+(2-0.1)ⅹ0.7=6.24+0.078+1.4-0.07=(6.24+1.4)+(0.078-0.07)=7.64+0.008=7.648

施往鱼390619.98*37 - 199.8*1.9+1998+0.82 如何用简便方法计算 -
喻詹泄19413083188 ______ 您好:19.98*37-199.8*1.9+1998x0.82=1998*0.37-1998*0.19+1998+0.82 =1998x(0.37-0.19+0.82)=1998x1=1998~如果你认可我的回答,请及时点击【采纳为满意回答...

施往鱼3906计算:(一0.8)十1.2十(一0.7)十(一2.1)十0.8十3.5 -
喻詹泄19413083188 ______ 原式= -0.8 + 1.2 - 0.7 -2.1 +0.8 + 3.5 = 1.9 希望能帮到你,请采纳 不明白可以追问

施往鱼3906用简便方法计算.6.45*102 0.47*0. -
喻詹泄19413083188 ______ (1)6.45*102,=6.45*100+6.45*2,=645+12.9,=657.9;(2)0.47*0.5*0.8,=0.47*(0.5*0.8),=0.47*0.4,=0.188;(3)0.46*1.9+0.54*1.9,=(0.46+0.54)*1.9,=1*1.9,=1.9;(4)0.027+9.9*0.27,=0.027+990.027,=0.027*(99+1),=0.027*100,=2.7;(5)15.8*69.3-68.3*15.8,=15.8*(69.3-68.3),=15.8*1,=15.8;(6)1.25*32*2.5.=(1.25*8)*(4*2.5),=10*10,=100.

施往鱼39061.9+1.99+199.1+0.3的简便计算 -
喻詹泄19413083188 ______ 1.9+1.99+199.1+0.3的简便计算 解:1.9+1.99+199.1+0.3 =(1.9+0.1)+(1.99+0.01)+(199.1-0.1)+(0.3-0.01) =2+2+199+0.29 =203.29

施往鱼39061.62÷[(8.1+1.9)x0.2]怎么算 -
喻詹泄19413083188 ______ 1.62÷[(8.1+1.9)x0.2] =1.62÷(10x0.2) =1.62÷2 =0.81