:两位数乘一位数加减混合运算属于数学中的加减乘除四则混合运算中没有除法的混合运算，按照四则混合运算的计算顺序是先计算乘除法再计算加减法，那么本题目中只有两位数乘一位数的乘法，那就按照两位数乘一位数的法则计算出积一后再按照题目中的顺序进行加减法计算。
4/9×4/3=16/27 1/3×1/3=1/9 1/2×1/3=1/6 2/7×7/2×2/7=2/7 21/25×25/42=1/2 4/5×3/4=3/5 8/7×1/2=4/7 7/4×1/4×1/2=7/32 1/7×1/2=1/14 2/3×5/6=5/9 1/5×3/8=3/40 3/5×5/8=3/8 6/7×3/2=9/7 5/6×8/3=20/9 4/11×3/4=3/11 4/9×3/8=1/6 5/3×1/5=1/3 4/3×4/9=16/27 1/3×1/2=1/6 2/7×1/2＝1/7 41/12×1/4=41/48 1/4×3/16=3/64 1/12×9/4=3/16 75/8×1/5=15/8 7/12×1/9＝ 7/108 2/3×7/3＝14/9 3/8×9/4＝27/32 5/3×3/5＝1 4/5×5/8＝1/2 7/9×9/7＝1 2/3×1/7=2/21 1/4×3/50=3/200 4/5×1/2= 2/5 2/3×29/8=29/12 3/2×7/9=7/6 2/3×3/4=1/2 5/6×1/3=5/18 6/5×1/6 =1/5 2/1×7/2=7 3/2×1/3=1/2 1/22×4/5=2/55 5/6×8/3=20/9 4/11×3/4=3/11 2/3×5/6=5/9 1/5×3/8=3/40 3/5×5/8=3/8 8/7×1/2=4/7 7/4×1/2=7/8 1/7×1/2=1/14 2/3×5/6=5/9 8/7×3/2=12/7 5/12×1/9＝5/108 7/4××1/2=7/8 1/7×1/2=1/14 2/3×5/6=5/9 2/3×1/2=1/3 2/3×5/6=5/9 1/5×3/8=3/40 2/3×7/3＝14/9 8/7×1/2=4/7 1/7×1/2=1/14 2/3×5/6=5/9 1/5×3/8=3/40 3/5×5/8=3/8 5/6×1/3=5/18 6/5×1/6 =1/5 2/1×7/2=7 3/2×1/3=1/2 1/22×4/5=2/55 5/6×8/3=20/9 4/11×3/4=3/11 2/3×5/6=5/9 1/5×3/8=3/40 3/5×5/8=3/8 4/3×4/9=16/27 1/3×1/2=1/6 1/7×5/2
