练 习 题 姓名- XX21 XX3. 6X22.16 = XX X +2.4=6 0.8X41.6 15X260 631.8=7.2 175=2.4+3 2+4.33=14 (1)1 342 3+2 13189.2 = 7(6.5+x)=87.5 (x-3)2=7.5 13.2x+9x=33.3 3x=x+100 = 简便运算:7/126+5/126 2/9-7/162/9 2/543/41/21/+15+1/31/2 5/65/9+5/91/6 (8/9+4/27)27873/86 (1/5+2/3)15 4/75/9+3/75/95/181/49/10 (1/4+2/9)36 7/113/84/9(5/8+5/6)4/25 5/7+5/6+2/7+1/6 1/15(1/3+1/12)1/4(3-5/13-8/13) 4/9【5/6-(1/6+1/3)】 (2/3+3/4)243/46/7+1/73/4 (5/12+3/8-1/4)24 2/9(1209)1/24