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1. 直接写出得数。
3.2+4.8=
3.5+0.75=
4.5×0.4=
3×c-5=
1.1-0.3=
1.25-0.5=
0.48÷0.8=
0.6×a×b=
0.25÷5=
5.6÷0.8=
0.56÷0.007=
a×a-8.1=
5.06÷10=
2.1÷0.3=
0.55×40=
4.6-0.5×b=
0.7×0.5=
3.3÷0.1=
8.5÷0.17=
4.5×m-n=
4.8×0.1=
50÷0.25=
1÷0.05=
2.4×a×2=
0.4×0.4=
6.4÷0.4=
82.5-3.25=
9x÷3+y=
0.35÷5=
8.3×100=
1.32×0.5=
c-1.8-2.2=
3.2+4.8=
8
3.5+0.75=
4.25
4.5×0.4=
1.8
3×c-5=
3c-5
1.1-0.3=
0.8
1.25-0.5=
0.75
0.48÷0.8=
0.6
0.6×a×b=
0.6ab
0.25÷5=
0.05
5.6÷0.8=
7
0.56÷0.007=
80
a×a-8.1=
a²-8.1
5.06÷10=
0.506
2.1÷0.3=
7
0.55×40=
22
4.6-0.5×b=
4.6-0.5b
0.7×0.5=
0.35
3.3÷0.1=
33
8.5÷0.17=
50
4.5×m-n=
4.5m-n
4.8×0.1=
0.48
50÷0.25=
200
1÷0.05=
20
2.4×a×2=
4.8a
0.4×0.4=
0.16
6.4÷0.4=
16
82.5-3.25=
79.25
9x÷3+y=
3x+y
0.35÷5=
0.07
8.3×100=
830
1.32×0.5=
0.66
c-1.8-2.2=
c-4
答案
8 4.25 1.8 3c-5 0.8 0.75 0.6 0.6ab 0.05 7 80 a²-8.1 0.506 7 22 4.6-0.5b 0.35 33 50 4.5m-n 0.48 200 20 4.8a 0.16 16 79.25 3x+y 0.07 830 0.66 c-4
解析
8；4.25；1.8；3c-5；0.8；0.75；0.6；0.6ab；0.05；7；80；$a^2 - 8.1$；0.506；7；22；4.6 - 0.5b；0.35；33；50；4.5m - n；0.48；200；20；4.8a；0.16；16；79.25；3x + y；0.07；830；0.66；c - 4
2. 计算下面各题。
21.4-9.03÷0.86
1.7÷(3.94+2.86)+3.5
(9.28÷3.2+75)×1.3
8.32×3.4+8.32×6.6
(8.1+2.32)×3.6-2.78
17.82+[0.75×(4.5+3.05)]
21.4-9.03÷0.86
1.7÷(3.94+2.86)+3.5
(9.28÷3.2+75)×1.3
8.32×3.4+8.32×6.6
(8.1+2.32)×3.6-2.78
17.82+[0.75×(4.5+3.05)]
答案
10.9 3.75 101.27 83.2 34.732 23.4825
解析
21.4-9.03÷0.86=21.4-10.5=10.9
1.7÷(3.94+2.86)+3.5=1.7÷6.8+3.5=0.25+3.5=3.75
(9.28÷3.2+75)×1.3=(2.9+75)×1.3=77.9×1.3=101.27
8.32×3.4+8.32×6.6=8.32×(3.4+6.6)=8.32×10=83.2
(8.1+2.32)×3.6-2.78=10.42×3.6-2.78=37.512-2.78=34.732
17.82+[0.75×(4.5+3.05)]=17.82+[0.75×7.55]=17.82+5.6625=23.4825
1.7÷(3.94+2.86)+3.5=1.7÷6.8+3.5=0.25+3.5=3.75
(9.28÷3.2+75)×1.3=(2.9+75)×1.3=77.9×1.3=101.27
8.32×3.4+8.32×6.6=8.32×(3.4+6.6)=8.32×10=83.2
(8.1+2.32)×3.6-2.78=10.42×3.6-2.78=37.512-2.78=34.732
17.82+[0.75×(4.5+3.05)]=17.82+[0.75×7.55]=17.82+5.6625=23.4825
按规律填写算式。
1+2+3+4+3+2+1
答案
1+2+3+4+3+2+1
