14.76-5.76-數(shù)學公式4數(shù)學公式÷8數(shù)學公式×2數(shù)學公式
64數(shù)學公式×數(shù)學公式6數(shù)學公式×5-3數(shù)學公式×2
13×數(shù)學公式+4數(shù)學公式×10198÷198數(shù)學公式+數(shù)學公式
12.5×數(shù)學公式+3數(shù)學公式×1.25數(shù)學公式+數(shù)學公式+數(shù)學公式+數(shù)學公式
(3.7×5數(shù)學公式-4.7×3.7)÷數(shù)學公式[0.3+(數(shù)學公式+□)×3]÷0.3=860
56×數(shù)學公式18.75-(4.5-7.25)
3.6×31數(shù)學公式+3.14×64132數(shù)學公式÷131
數(shù)學公式+4×數(shù)學公式+5×數(shù)學公式+6×數(shù)學公式112×(24-4數(shù)學公式)÷2.4
(81.4+數(shù)學公式+數(shù)學公式+數(shù)學公式)÷(數(shù)學公式+數(shù)學公式+數(shù)學公式41.2×8.1+11×9數(shù)學公式+53.7×1.9
數(shù)學公式+數(shù)學公式+數(shù)學公式+數(shù)學公式+數(shù)學公式+數(shù)學公式+數(shù)學公式數(shù)學公式+數(shù)學公式+數(shù)學公式+…+數(shù)學公式

解:
(1)14.76-5.76-
=9-,
=8;

(2)4÷8×2
=××,
=;

(3)64×
=×,
=

(4)6×5-3×2,
=(6+)×5-(3+)×2,
=(6×5+×5)-(3×2+×2),
=30+-6-,
=(30-6)+(-),
=24+,
=26

(5)13×+4×10,
=5+46,
=51;

(6)198÷198+,
=198×+
=+,
=1;

(7)12.5×+3×1.25,
=1.25×10×+3×1.25,
=1.25×+3×1.25,
=1.25×(+3),
=1.25×5,
=6.25;

(8)+++,
=+++
=1-+-+-+-,
=1-,
=

(9)(3.7×5-4.7×3.7)÷,
=3.7×(5-4.7)÷,
=3.7×1÷,
=3.7÷
=11.1;

(10)[0.3+(+□)×3]÷0.3=860,
[0.3+(+□)×3]÷0.3=860,
[0.3+1.5+□×3]÷0.3=860,
[1.8+□×3]÷0.3=860,
6+10×□=860,
10×□=854,
□=85.4;

(11)56×,
=(55+1)×
=55×+1×,
=54+,
=54

(12)18.75-(4.5-7.25),
=18.75-4.5+7.25,
=(18.75+7.25)-4.5,
=26-4.5,
=21.5;

(13)3.6×31+3.14×64,
=3.6×31.4+3.14×64,
=3.6×31.4+31.4×6.4,
=(3.6+6.4)×31.4,
=10×31.4,
=314;

(14)132÷131,
=(131+1)×,
=131×+1×,
=1+×,
=1+
=1;

(15)3×+4×+5×+6×,
=(3×+5×)+(4×+6×),
=+,
=2+6,
=8;

(16)112×(24-4)÷2.4,
=112×(24-4.8)×
=112×(24×-4.8×),
=112×(10-2),
=112×8,
=896;

(17)(81.4+++)÷(++),
=(81.4+)÷,
=(81.4+)×,
=81.4×+×
=132+1,
=133;

(18)41.2×8.1+11×9+53.7×1.9,
=41.2×8.1+11×9.25+(41.2+12.5)×1.9,
=41.2×8.1+11×9.25+41.2×1.9+12.5×1.9,
=(41.2×8.1+41.2×1.9)+11×9.25+12.5×1.9,
=41.2×(8.1+1.9)+11×(8+1.25)+12.5×1.9,
=41.2×10+11×8+11×1.25+1.25×19;
=412+88+1.25×(11+19),
=500+1.25×30,
=500+37.5,
=537.5;

(19)++++++,
=++++++,
=1-+-+-+-+-+-+-,
=1-,
=;

(20)+++…+
=×(1-+-+-+…+-),
=×(1-),
=×,
=
分析:(1)按照從左向右的順序進行計算;
(2)按照從左向右的順序進行計算;
(3)把帶分數(shù)化成假分數(shù),再約分計算;
(4)根據(jù)乘法分配律進行計算;
(5)先算乘法,再算減法;
(6)先算乘法,再算加法;
(7)根據(jù)乘法分配律進行計算;
(8)根據(jù)分數(shù)的拆項進行計算;
(9)小括號里面的根據(jù)乘法分配律進行計算,再算除法;
(10)把□看作未知數(shù),根據(jù)等式的性質(zhì)進行解方程即可;
(11)根據(jù)乘法分配律進行計算;
(12)去掉括號,再根據(jù)加法交換律進行計算;
(13)根據(jù)乘法分配律進行計算;
(14)根據(jù)乘法分配律進行計算;
(15)根據(jù)加法交換律和結(jié)合律進行計算;
(16)根據(jù)乘法分配律進行計算;
(17)先算小括號里面的加法,根據(jù)乘法分配律進行計算;
(18)根據(jù)乘法分配律進行計算;
(19)根據(jù)分數(shù)的拆項進行計算;
(20)根據(jù)分數(shù)的拆項進行計算.
點評:四則運算,先弄清運算順序,然后再進一步計算,能簡算的要簡算.
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