4\/7+3\/8+5\/7+3\/8=分数什么?
=(4\/7+5\/7)+(3\/8+3\/8)=9\/7+6\/8 =1+2\/7+3\/4 =1+2\/7+1-1\/4 =(1+1)+(2\/7-1\/4)=2+(8\/28-7\/28)=2+1\/28 =2又1\/28
3\/4+5\/7+5\/8等于多少分数?
3\/4+5\/7+5\/8 =42\/56+40\/56+35\/56 =117\/56 =2+5\/56
3\/8÷(7\/8+3\/4)简便计算
考查混合运算,有括号,先算括号里面的。如图:(异分母,先通分)
3\/8-2\/7+5\/8等于多少,过程?
答:3\/8-2\/7+5\/8等于5\/7
5\/8+5\/8+5\/8等于几?
解:5\/8+5\/8+5\/8等于( 15\/8 ),【即等于1.875】∵已知需求出5\/8+5\/8+5\/8等于几 ∴5\/8 + 5\/8 + 5\/8 = 5\/8 × (1 + 1 + 1)= 5\/8 × (2 + 1)= 5\/8 × 3 = 15\/8 = 1.875 答:5\/8+5\/8+5\/8等于15\/8,【即等于1.875】...
5\/7+3\/8等于多少?
解:异分母分数相加减,先通分,把它变成同分母分数再加减 5\/7+3\/8=40\/56+21\/56=61\/56 望采纳,谢谢
3\/7+3\/8( )4\/9+3\/7 5\/9+1\/12( )1\/15+5\/9 1\/7+1\/6( )5\/6-1\/3 1-7\/1...
小于,大于,小于,大于
9\/7+1\/8+3\/8+5\/7简便运算?
9\/7+1\/8+3\/8+5\/7可以同分母的先相加,也就是采用加法交换律,具体如下:9\/7+1\/8+3\/8+5\/7 =(9\/7+5\/7)+(1\/8+3\/8)=14\/7+4\/8 =2+1\/2 =4\/2+1\/2 =5\/2
8分之5减7分之2加8分之3减7分之5的简便计算法是?
用交换律和结合律计算比较简便,看图。
5\/7x3\/8+3\/7x5\/8简便运算。
5\/7x3\/8+3\/7x5\/8简便运算。=3\/7×5\/8+3\/7×5\/8 =3\/7×5\/8×(1+1)=3\/7×5\/8×2 =15\/28