6.8×16.8+19.3×3.2
=6.8×16.8+16.8×3.2+2.5×3.2
=16.8×(6.8+3.2)+2.5×4×0.8
=16.8×10+10×0.8
=168+8
=176
6.8x16.8+19.3x3.2
=6.8 x16.8+(16.8+2.5)x3.2
= 6.8x16.8+16.8x3.2+2.5x3.2
=16.8x(6.8+3.2)+2.5x(4-0.8)
=168+2.5x4-2.5x0.8
=168+10-2
=176
176
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