=1.25×9.8×65.2-1.25×10×0.652×18
=1.25×(9.8×65.2-10×0.652×18)
=1.25×(9.8×65.2-65.2×1.8)
=1.25×65.2×(9.8-1.8)
=1.25×65.2×8
=(1.25×8)×65.2
=10×65.2
=652
=1.25×9.8×65.2-1.25×10×0.652×18
=1.25×(9.8×65.2-10×0.652×18)
=1.25×(9.8×65.2-65.2×1.8)
=1.25×65.2×(9.8-1.8)
=1.25×65.2×8
=(1.25×8)×65.2
=10×65.2
=652