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六年级分数混合计算题

1. 3/7 * 49/9 - 4/3 2. 8/9 * 15/36 + 1/27 3. 12* 5/6 2/9 *3 4. 8* 5/4 + 1/4 5. 6÷ 3/8 3/8 ÷6 6. 4/7 * 5/9 + 3/7 * 5/9 7. 5/2 -( 3/2 + 4/5 ) 8. 7/8 + ( 1/8 + 1/9 ) 9. 9 * 5/6 + 5/6 10.

①先算乘除再算加减,有括号的先算括号里的,同一级运算从左往右依次运算.

题:5/9x(9/5+18) 5/9x5/6+4/9÷6/5 =5/9*9/5+5/9*18 =5/9*5/6+4/9*5/6 =1+10 =(5/9+4/9)*5/6 =11 =1*5/6 =5/613/14-15/28÷5/8 4÷4/5-4/5÷4 =13/14-15/28*8/5 =4*5/4-4/5*1/4 =13/14-3/7*2 =5+1/5 =13/14-6/7 =26/5 =1/14 (5/6-3/4)÷3/8 7/11÷[2/5-(1-7/10)} =(5/6-3/4)*8/3 =7/11÷[2/5-3/10] =5/6*8/3-3/4*8/3 =7/11÷1/10 =20/9-2 =70/11 =2/9

口算练习:(1)分数和整数相乘的时候,分母病变,分子和整数相乘.最后的结果要化成最简分数.如2/9x3=6/9=2/3(2)分数和整数相除的时候,分数可以乘以除数的倒数.如:2/9÷3=2/9x1/3=2/27计算分数连乘:(1)在计算分数连乘的时候,

(1)3643-74+6357-76=9850 (2)39*24+39*46+39*30=3900 (3)108*35=3780 (4)345*98=33810 (5)25*64*125*5=1000000 (6)8500÷25=340 (7)94*73+27*94=9400 (8)125*79=9875 (9)1.2*99=118.8 (10)9÷0.25=36 (11)4.7*5.9+5.2*4.7-4.7*0.1=51.

12.65+3.5= 85.6-3.21= 12.65+3.5= 85.6-3.21= 12.65+7.5= 83.6-4.35= 12.65+7.5= 83.6-4.35= 32.7+7.52= 55.6-5.75= 32.7+7.52= 55.6-5.75=计算,有些能简便62616964757a686964616fe4b893e5b19e31333361316631的要简便计算:89*99+89

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