6.3÷(5.25×0.8)
=6.3÷[5×0.8+0.25×0.8]
=6.3÷4.2
=3/2
36.4÷0.4×4.7+4.7×9
=91×4.7+4.7×9
=(91+9)×4.7
=100×4.7
=470
16.8×5.7+3.4×16.8-9.1×16.8
=16.8×(5.7+3.4-9.1)
=16.8×0
=0
6.3÷(5.25×0.8)
=6.3÷[5×0.8+0.25×0.8]
=6.3÷4.2
=3/2
36.4÷0.4×4.7+4.7×9
=91×4.7+4.7×9
=(91+9)×4.7
=100×4.7
=470
16.8×5.7+3.4×16.8-9.1×16.8
=16.8×(5.7+3.4-9.1)
=16.8×0
=0