1. 直接写出得数。
8.5÷5= 3.25+2.08= 10−0.57= (6.3+1.7)÷0.4=
7.2÷0.9= 80÷0.5= 0.2×8.4= 7.7÷77×10=
5.4−2.8= 1.3×0.7= 20.3+7.7= 3.42×0.2−0.2=
1.8+2.22= 29.5−5.9= 2.4x−1.2x= 120×0.25×0.4=
0.04×500= 16×0.03= 3.9÷0.3= 2.1+0.6−1.9=
24.8÷80= 54×0.2= 7.65−5.24= 22.5÷0.5×5=
1.85÷0.1= 9.5+5= 0.87+0.3= 13.13÷13−0.01=
2.5×0.08= 75×0.2= 7.6÷4= 4.57−0.23−0.34=
6.3+7= 1.8×0.6= 0.64÷8= 13.9+6.3−3.9=

1. 1.7 5.33 9.43 20
8 160 1.68 1
2.6 0.91 28 0.484
4.02 23.6 1.2x 12
20 0.48 13 0.8
0.31 10.8 2.41 225
18.5 14.5 1.17 1
0.2 15 1.9 4
13.3 1.08 0.08 16.3

2. 解方程。
13x−2.5x=210 x÷3=4.2+2.4 6x+3×11=48
7x+2.8=5.6 18×3−3x=32.4 40+1.5x=160

2. x=20 x=19.8 x=2.5
x=0.4 x=7.2 x=80

3. 看图列方程并解答。

3. 5x-80=370 x=90
x+5x=27 x=4.5