一、数与代数数的运算1简便计算

一数代（）的算简计下面各题怎样算简便就怎样算。6.9＋4.8＋3.1＋6.22＋

36.8－3.9－×13.1－15.6－15.6×15.89＋(6.75－5.89)4.02＋5.4＋0.98

4.8×7.8＋×0.52＋4.9－5.17－1.8－3.2－(3.75＋6.48)

4.8×100.1×9.9＋3.68＋－2.687.852.34－0.85＋4.66

7.09×－0.8×7.0925.48－(9.4－0.52)35.6－1.8－－7.22.9＋0.18＋9.1

4.2÷3.5÷1.25÷9.6＋4.8－3.67.14－0.53－

18.76×9.9＋18.763.52÷÷0.45.27＋－0.66＋1.6313.35－4.68＋2.65

3.9－4.1＋6.1－5.9÷3.573.8－－13.8－5.360.398+0.36+3.64

9.6÷0.8÷99＋17.8÷(1.78×0.491.415.75+3.59－0.59+14.2566.86－8.66－1.25×2.5×3.65×10.10.25×16.2×－0.125)×815.2÷÷0.89×100.13.6×1023.72×3.5＋×

146.5－(23＋46.5)4.56＋3.83×5.4413.7×0.25－3.7÷2.22×9.9+6.66×4.36×××＋9.71010.87-0.91×87×16.1-15.1×10.727.5×3.7－7.5×÷÷0.79199

4.8+8.63+5.2+0.370.65××0.25×12.5

5.93+0.19+2.811.76+0.195+3.24(45.9－32.7)÷÷0.125×＋31.4×0.032

2.35+1.713+0.287+7.651.57+0.245+7.435.6÷÷0.8÷÷0.47.2×＋2.4×

6.02+3.6+1.980.134+2.66+0.8668.9×1.01×（2.8－1.3）＋1.5×2.26

1.27+3.9+0.73+16.17.5＋－6.53.9×2.7＋3.9×181.8÷÷0.8

3.07－－＋3.7＋2.71＋12.7×9.9＋1.2721（9.3－3.7）－

8－2.45－1.55＋1.79－0.59＋1.7515.02-6.8-1.02×

23.4－0.8－13.4－7.2×4032.3××23+2.3（）3.2＋0.36＋＋1.23＋3.4－0.23＋3.65×4.7－×0.3746×57＋×

4+53++1+41+1++2+610+3+4+3390.25×12.7－（3.7＋0.84）36.54－4+53++1+41+1++2+610+3+4+339

4.5÷1.84.23.57.6×0.8＋0.2××199

930÷0.6÷63.4÷2.5÷0.40.25×8.5×1.288.6＋0.72×8.6

4.9÷1.4÷（1.3×）（7.7＋1.540.7×2.412.5××0.89.6×2.7÷4515（0.15×0.4）0.8×（4.3×）3.123.12×0.35×××0.832.4×0.9＋0.1×32.428.6×101－28.60.86×－×2.4×2.31×1.2×0.5

113474

134514－－2.682.64＋＋7.36＋11.33

97516

175161561570÷28

（2.5－0.2