能简算的要简算 1、2/3×5/7+2/3×2/7

问题描述:

能简算的要简算 1、2/3×5/7+2/3×2/7
2、7/2×3/7÷6 3、8×5/6+2/5÷4 4、(1/2+2/5)÷3/2

2/3×5/7+2/3×2/7= 2/3×(5/7+2/7)= 2/3 2、7/2×3/7÷6 = 3/2 x 1/6= 1/4 3、8×5/6+2/5÷4 = 4 x 5/3 + 1/5 x 1/2 = 20 /3 + 1/10= (200+ 3 ) /30= 203 /304、(1/2+2/5)÷3/2 = (5+4 ) /10 x 2/3 = 9/10 x 2/3=...