脱式计算．（能简算的要简算）（1）143+3038686+90909434343+131313868686（2）6.75−2.75÷[10×(9.75−414)]（3）0.365×640+312×36.5+365×0.01．

Question

脱式计算．（能简算的要简算）
（1）(1)/(43)+(303)/(8686)+(90909)/(434343)+(131313)/(868686)
（2）6.75−2.75÷[10×(9.75−4(1)/(4))]
（3）0.365×640+3(1)/(2)×36.5+365×0.01．

Answer 1

（1）(1)/(43)+(303)/(8686)+(90909)/(434343)+(131313)/(868686)，
=(1)/(43)+(3×101)/(86×101)+(9×10101)/(43×10101)+(13×10101)/(86×10101)，
=(1)/(43)+(3)/(86)+(9)/(43)+(13)/(86)，
=（(1)/(43)+(9)/(43)）+（(3)/(86)+(13)/(86)），
=(10)/(43)+(8)/(43)，
=(18)/(43)；
（2）6.75-2.75÷[10×（9.75-4(1)/(4)）]，
=6.75-2.75÷[10×（9.75-4.25）]，
=6.75-2.75÷[10×5.5]，
=6.75-2.75÷55，
=6.75-0.05，
=6.7；     
（3）0.365×640+3(1)/(2)×36.5+365×0.01，
=36.5×6.4+3.5×36.5+36.5×0.1，
=36.5×（6.4+3.5+0.1），
=36.5×10，
=365．