1.直接写出得数。
7.83×4=
5.43×1.1−0.543=
9.18−0×9.18=
20×0.38=
0.51÷(0.3+0.7)=
(0.53+0.47)×0=
13÷2=
9.9−11÷10=
720÷24×12=
8.56÷100=
(11.3−0.7)×0.1=
0.6×0.12×5=
9.12−4.89=
50÷25×0.4=
(81.8−0.18)×0.1=

1. 31.32 5.43 9.18 7.6 0.51 0 6.5 8.8 360 0.0856 1.06 0.36 4.23 0.8 8.162

2. 在 ○ 里填上“＞”“＜”或“=”。
8.09×1.1 ○ 8.11×1.1
7.6×2 ○ 7.6+2
2.4×5 ○ 2.5×4
19.8×1 ○ 19.8÷1
15.3−3 ○ 15.3÷3
54×1.6 ○ 0.16×54
48×0.5 ○ 48÷2
28.5×0.98 ○ 28.5×0.89

＜ ＞ ＞ = ＞ ＞ = ＞

3. 递等式计算。(能简算的要简算)
17.52−3.17−4.83
12.81+24.56+7.19
17×8×1.25
8.6×98+0.2×86
14.85−4.85×2
(0.4+0.8)×25×125

3. 17.52−3.17−4.83=17.52−(3.17+4.83)=17.52−8=9.52
12.81+24.56+7.19=12.81+7.19+24.56=20+24.56=44.56
17×8×1.25=17×(8×1.25)=17×10=170
8.6×98+0.2×86=8.6×98+2×8.6=8.6×(98+2)=8.6×100=860
14.85−4.85×2=14.85−9.7=5.15
(0.4+0.8)×25×125=0.4×25×125+0.8×125×25=1250+2500=3750