0.3+2.5+0.4的简便算法

韦洋辉1428把0.1 0.2 0.3 0.4 0.5 通过运算符号和扩号连接起来使其等于1 2 3 4 5 6 7 8 9 10每个数只能用一次...急! -
秋斌菊17885514494 ______[答案] (0.5/0.1)-0.4/(0.3-0.2)=1(0.1+0.3+0.4)/0.2*0.5=2(0.3/0.1)/(0.4*0.5/0.2)=3(0.4/0.1)/(0.2+0.3+0.5)=4(0.4/0.1)+(0.2+0.3)/0.5=5(0.2/0.1)*0.3/(0.5-0.4)=6(0.5/0.1)+0.2/(0.4-0.3)=7(0.1+0.3+0.4)/0.2/0.5=8(0.5...

韦洋辉1428如果0.2()4=0.2+0.3+0.4+0.5,0.3()5=0.3+0.4+0.5+0.6+0 -
秋斌菊17885514494 ______ 如果0.2()4=0.2+0.3+0.4+0.5,0.3()5=0.3+0.4+0.5+0.6+0.7,那么0.4()6=0.4+0.5+0.6+0.7+0.8+0.90.7(4)=0.7+0.8+0.9+1.0

韦洋辉14282.5*0点3*0点四的简便计算? -
秋斌菊17885514494 ______ 这个可以先计算2.5*0.4等于1,所以最后结果是0.3

韦洋辉14282.3/2.5的简便计算急急急 -
秋斌菊17885514494 ______ 2.3/2.5=(2.3+2.3)/(2.5+2.5)=4.6/5=0.92 或者2.3/2.5=(2.3+2.3)/(2.5+2.5)=4.6/5=(4.6+4.6)/(5+5)=9.2/10=0.92 再或者2.3/2.5=(2.5-0.2)/2.5=1-0.2/2.5=1-0.2*0.4=1-0.08=0.92

韦洋辉14280.3+0.7+1.1+...+9.9怎么计算? -
秋斌菊17885514494 ______ 【俊狼猎英】团队为您解答 0.3+0.7+1.1+...+9.9 用n表示为 0.4n-0.1,所以 0.4n-0.1=9.9 ,可得n=25,所以这个数列一共25项 0.3+0.7+1.1+...+9.9 =(0.3+9.9)*25/2 =127.5

韦洋辉14280.1 0.4 ( ) 1.6 ( ) 3.6 -
秋斌菊17885514494 ______ 0.1 0.4 (0.9 ) 1.6 ( 2.5) 3.6

韦洋辉14280.4*2.3x3.8的简便计算 -
秋斌菊17885514494 ______[答案] 0.4*2.3*3.8 =0.4*2.3*(1.3+2.5) =0.4*2.3*1.3+0.4*2.3*2.5 =0.4*2.3*1.3+2.3 =2.3*(0.4*1.3+1) =2.3*(0.4*(1+0.3)+1) =2.3*(0.12+0.4+1) =3.496

韦洋辉1428简便计算:2.5x2.3+1.2+0.25 -
秋斌菊17885514494 ______ 2.5*(2+0.3)+1.2+2.5*0.1 =2.5*(2+0.4)+2.4*0.5 =(2.5+0.5)*2.4 =7.2

韦洋辉1428直接写出下面各题的得数.0.5+0.4= 7.6+0.3= 0.8 - 0.1= 2.3+4.5=5.3+1.6= 4.9 - 2.5= 7.3+2.6= 5.9 - 3.2=1 - 0.5= 4.2+2.6= 8.7 - 3.5= 3.6+5.2= -
秋斌菊17885514494 ______[答案] 0.5+0.4=0.9; 7.6+0.3=7.9; 0.8-0.1=0.7; 2.3+4.5=6.8; 5.3+1.6=6.9; 4.9-2.5=2.4; 7.3+2.6=9.9; 5.9-3.2=2.7; 1-0.5=0.5; 4.2+2.6=6.8; 8.7-3.5=5.2; 3.6+5.2=8.8.

韦洋辉14285.3/0.4*0.3用最简便的方法计算 -
秋斌菊17885514494 ______ 5.3/0.4*0.3=(5.2+0.1)*2.5*0.3=5.2/4*0.3+0.075=3.975