5/9 ×0.875+4/9×八分之七+八分之七
=5/9×7/8+4/9×7/8+7/8
=7/8×(5/9+4/9+1)
=7/8×2
=7/4
(3/20×0.4×21/10)÷(0.6×1/2×0.63)
=(0.15×0.4×2.1)÷(0.6×0.5×0.63)
=(0.06×2.1)÷(0.3×0.63)
=0.126÷0.189
=(0.063×2)÷(0.063×3)
=2÷3
=1.5
5/9 ×0.875+4/9×八分之七+八分之七
=5/9×7/8+4/9×7/8+7/8
=7/8×(5/9+4/9+1)
=7/8×2
=7/4
(3/20×0.4×21/10)÷(0.6×1/2×0.63)
=(0.15×0.4×2.1)÷(0.6×0.5×0.63)
=(0.06×2.1)÷(0.3×0.63)
=0.126÷0.189
=(0.063×2)÷(0.063×3)
=2÷3
=1.5