1 直接写出得数。(每题1分,共20分)
$8.8+1.2= $ $39.5-16.8= $ $0.32÷0.8= $ $4.2÷0.2= $
$98.7-73.8= $ $92+18.7= $ $65.2-12.6= $ $95+118= $
$9.7-8.5= $ $45×0.4= $ $128.9-47.6= $ $67.3-22.4= $
$20-15.5= $ $9.84-4.92= $ $0.42÷0.7= $ $4.2÷2.1= $
$0.37×0.4= $ $9.85-4.57= $ $18+37.5= $ $3.92+7.2= $
$8.8+1.2= $ $39.5-16.8= $ $0.32÷0.8= $ $4.2÷0.2= $
$98.7-73.8= $ $92+18.7= $ $65.2-12.6= $ $95+118= $
$9.7-8.5= $ $45×0.4= $ $128.9-47.6= $ $67.3-22.4= $
$20-15.5= $ $9.84-4.92= $ $0.42÷0.7= $ $4.2÷2.1= $
$0.37×0.4= $ $9.85-4.57= $ $18+37.5= $ $3.92+7.2= $
答案
10 22.7 0.4 21
24.9 110.7 52.6 213
1.2 18 81.3 44.9
4.5 4.92 0.6 2
0.148 5.28 55.5 11.12
24.9 110.7 52.6 213
1.2 18 81.3 44.9
4.5 4.92 0.6 2
0.148 5.28 55.5 11.12
2 计算下列各题,能简算的要简算。(每题3分,共18分)
$0.125×3.2×0.25$ $0.125×8.54×80$ $5.4×2.08+66×0.208-2.08$
$1.25×0.7×0.8$ $23.4-0.8-13.4-7.2$ $9.07-22.78÷3.4$
$0.125×3.2×0.25$ $0.125×8.54×80$ $5.4×2.08+66×0.208-2.08$
$1.25×0.7×0.8$ $23.4-0.8-13.4-7.2$ $9.07-22.78÷3.4$
答案
0.1 85.4 22.88
0.7 2 2.37
0.7 2 2.37
3 解方程。(每题4分,共12分)
$2x-9.1= 4.7$ $1.5+5x= 31.5$ $5.8×4.5+0.4x= 29.1$
$2x-9.1= 4.7$ $1.5+5x= 31.5$ $5.8×4.5+0.4x= 29.1$
答案
解:$x=6.9$ 解:$x=6$ 解:$x=7.5$
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