16.8×12.8-2.8+简便运算?
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=16.8×(10+2.8)-2.8
=16.8×10+16.8×2.8-2.8
=168+2.8(16.8-1)
=168+2.8×15.8
=168+(3-0.2)(16-0.2)
=168+3×16-3×0.2-0.2×16+0.2×0.2
=168+48-0.6-3.2+0.04
=168+48-3.8+0.04
=168+44.2+0.04
=168+44.24
=168+32+12.24
=200+12.24
=212.24
=16.8×10+16.8×2.8-2.8
=168+2.8(16.8-1)
=168+2.8×15.8
=168+(3-0.2)(16-0.2)
=168+3×16-3×0.2-0.2×16+0.2×0.2
=168+48-0.6-3.2+0.04
=168+48-3.8+0.04
=168+44.2+0.04
=168+44.24
=168+32+12.24
=200+12.24
=212.24
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