1. 直接写出得数。(20☆)
134×20=
62÷10=
5.3−3.7=
270÷3÷5=
140÷4=
70×4.5=
5.15−0.85=
350÷7+194=
3.7+2.3=
25×200=
0.72+1.38=
10−16.4÷4=
720÷20=
0.6×1.7=
5.8+4.6=
3.5×11−3.5=
20×7.9=
0.36+1.74=
10.8÷5.4=
12−7.3−2.7=
86×50=
4.59−2.52=
20.7+19.1=
0.4×65×25=
8.4×5=
0.46+2.14=
44.16÷2=
26.4+1.73+3.6=
3.6×0.4=
7.2+2.84=
4.04÷10=
6.5+5.2+4.8=
$\frac{3}{4}-\frac{2}{9}=$
$\frac{2}{11}+\frac{2}{3}=$
$\frac{4}{15}+\frac{7}{30}=$
$1-\frac{7}{12}-\frac{5}{12}=$
$\frac{5}{7}+\frac{1}{4}=$
$\frac{10}{11}-\frac{9}{22}=$
$\frac{4}{15}+\frac{2}{5}=$
$1-\frac{2}{15}+\frac{13}{15}=$

2680 6.2 1.6 18
35 315 4.3 244
6 5000 2.1 5.9
36 1.02 10.4 35
158 2.1 2 2
4300 2.07 39.8 650
42 2.6 22.08 31.73
1.44 10.04 0.404 16.5
$\frac{19}{36}$ $\frac{28}{33}$ $\frac{1}{2}$ 0
$\frac{27}{28}$ $\frac{1}{2}$ $\frac{2}{3}$ $\frac{26}{15}$

2. 根据运算律和运算性质,在$□$里填数,在$◯$里填运算符号。(8☆)
$1\frac{3}{7}+\frac{1}{2}+\frac{4}{7}=\frac{1}{2}+(□+□)$
$\frac{7}{5}-\frac{1}{4}-\frac{3}{4}=\frac{7}{5}-(□◯□)$
$35×198=35×200-35×□$
$1400÷(7×25)=1400÷7◯25$
$(21×25)×□=21×(□×2)$
$168+(79+132)=168◯□◯□$
$66÷0.5÷2=66÷(□◯□)$
$(125+25)×0.8=125◯□+□×□$

$1\frac{3}{7}$ $\frac{4}{7}$ $\frac{1}{4}$ + $\frac{3}{4}$ 2 ÷
2 25 + 132 + 79
0.5 × 2 × 0.8 25 0.8

3. 计算下面各题,能简算的要简算。(27☆)
$9.5×10 + 5.5×10$
$12×150 - 1600÷25$
$63×36 + 63×63 + 63$
$10÷2.5 + 2.5×0.8$
$8.29 + 45.7 + 1.71 - 5.7$
$27×[(428 + 196)÷48]$
$\frac{4}{5} - ( \frac{2}{15} + \frac{1}{3} )$
$\frac{5}{12} - ( \frac{1}{4} - \frac{1}{6} ) + \frac{1}{2}$
$\frac{3}{8} + \frac{1}{2} + \frac{5}{11}$

150 1736 6300
6 50 351
$\frac{1}{3}$ $\frac{5}{6}$ $1\frac{29}{88}$