简便运算：0.9999×0.7+0.1111×2.7；36×1.09+1.2×67.3；48×1.08+1.2×56.8；335×2525+37.9×625；6.8×16.8+19.3×3.2；81.5×15.8+81.5×51.8+67.6×18.5．

Question

简便运算：
0.9999×0.7+0.1111×2.7；
36×1.09+1.2×67.3；
48×1.08+1.2×56.8；
3(3)/(5)×25(2)/(5)+37.9×6(2)/(5)；
6.8×16.8+19.3×3.2；
81.5×15.8+81.5×51.8+67.6×18.5．

Answer 1

①0.9999×0.7+0.1111×2.7
=0.1111×9×0.7+0.1111×2.7
=0.1111×6.3+0.1111×2.7
=0.1111×（6.3+2.7）
=0.1111×9
=0.9999

②36×1.09+1.2×67.3
=1.2×30×1.09+1.2×67.3
=1.2×32.7+1.2×67.3
=1.2×（32.7+67.3）
=1.2×100
=120

③48×1.08+1.2×56.8
=1.2×40×1.08+1.2×56.8
=1.2×43.2+1.2×56.8
=1.2×（43.2+56.8）
=1.2×100
=120

④3(3)/(5)×25(2)/(5)+37.9×6(2)/(5)
=3.6×25.4+37.9×6.4
=25.4×（3.6+6.4）+12.5×6.4
=25.4×10+12.5×8×0.8
=254+100×0.8
=254+80
=334

⑤6.8×16.8+19.3×3.2
=16.8×（6.8+3.2）+2.5×3.2
=16.8×10+2.5×4×0.8
=168+10×0.8
=168+8
=176

⑥81.5×15.8+81.5×51.8+67.6×18.5
=81.5×（15.8+51.8）+67.6×18.5
=81.5×67.6+67.6×18.5
=67.6×（81.5+18.5）
=67.6×100
=6760