=2.4x2x0.6+4.8x1.1+1.7x5.2
=4.8x0.6+4.8x1.1+1.7x5.2
=4.8x(0.6+1.1)+1.7x5.2
=4.8x1.7+1.7x5.2
=1.7x(4.8+5.2)
=1.7x10=17
2.4×1.2+4.8×1.1+1.7×5.2
=4.8×0.6+4.8×1.1+1.7×5.2
=4.8×(1.1+0.6)+1.7×5.2
=4.8×1.7+1.7×5.2
=(4.8+5.2)×1.7
=10×1.7
=17
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