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① 直接写出得数。(每题1分,共20分)
9.35+1.59=
1.12×0.3=
899-672=
31.8-9.9=
18.7-4.6=
0.6×0.75=
68.4-27.6=
3.68+1.96=
6×0.8=
0.5+1÷1=
17+6.9=
2.5×4=
16-9.9=
1.6×7=
0.25×4=
92.5+48.1=
66.5+38.2=
29.1-15=
4.2-1.6=
6.2-5.1=
9.35+1.59=
1.12×0.3=
899-672=
31.8-9.9=
18.7-4.6=
0.6×0.75=
68.4-27.6=
3.68+1.96=
6×0.8=
0.5+1÷1=
17+6.9=
2.5×4=
16-9.9=
1.6×7=
0.25×4=
92.5+48.1=
66.5+38.2=
29.1-15=
4.2-1.6=
6.2-5.1=
答案
1. 10.94 0.336 227 21.9
14.1 0.45 40.8 5.64
4.8 1.5 23.9 10
6.1 11.2 1 140.6
104.7 14.1 2.6 1.1
14.1 0.45 40.8 5.64
4.8 1.5 23.9 10
6.1 11.2 1 140.6
104.7 14.1 2.6 1.1
② 计算。(每题3分,共18分)
$3.64÷(1.9-0.5)$
$63.4÷2.5÷0.4$
$11.5×3.7-2.5×3.7+3.7$
$1.75÷0.25×6$
$0.92×1.01$
$327×2.8+17.3×28$
$3.64÷(1.9-0.5)$
$63.4÷2.5÷0.4$
$11.5×3.7-2.5×3.7+3.7$
$1.75÷0.25×6$
$0.92×1.01$
$327×2.8+17.3×28$
答案
2. 2.6 63.4 37
42 0.9292 1400
42 0.9292 1400
③ 解方程。(每题4分,共12分)
$3x+2=8.6$
$4.2x+3×1.3=16.5$
$4x+1.6x=18.48$
$3x+2=8.6$
$4.2x+3×1.3=16.5$
$4x+1.6x=18.48$
答案
3. 解:$x=2.2$ 解:$x=3$ 解:$x=3.3$
