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1. 直接写出得数。(每题 1★)
$60÷5= $ $3.08+1.2= $ $7.5×0.4= $ $3.2×0.5= $
$2.1÷2= $ $4.5+0.76= $ $3.57÷7= $ $9.6÷0.06= $
$80÷0.8= $ $1800÷200= $ $48÷0.06= $ $0.05×90= $
$12×30= $ $15.5+0.5= $ $3.8×0.2= $ $4.6÷0.23= $
$2.7×2= $ $3.2×0.06= $ $6.5÷1.3= $ $77÷0.07= $
$60÷5= $ $3.08+1.2= $ $7.5×0.4= $ $3.2×0.5= $
$2.1÷2= $ $4.5+0.76= $ $3.57÷7= $ $9.6÷0.06= $
$80÷0.8= $ $1800÷200= $ $48÷0.06= $ $0.05×90= $
$12×30= $ $15.5+0.5= $ $3.8×0.2= $ $4.6÷0.23= $
$2.7×2= $ $3.2×0.06= $ $6.5÷1.3= $ $77÷0.07= $
答案
12 4.28 3 1.6 1.05 5.26 0.51 160 100 9 800 4.5 360 16 0.76 20 5.4 0.192 5 1100
2. 计算下面各题,能简算的要简算。(每题 3★)
$0.125×2.58×0.8$ $5.87×99+5.87$ $4.25÷0.25+5.75÷0.25$
$0.125×2.58×0.8$ $5.87×99+5.87$ $4.25÷0.25+5.75÷0.25$
答案
0.258 587 40
3. 解方程。(每题 3★)
$4x+2.6×5= 27$ $0.73×3-3x= 0.06$ $0.25×(9-x)= 1$
$4x+2.6×5= 27$ $0.73×3-3x= 0.06$ $0.25×(9-x)= 1$
答案
$ x = 3.5 $ $ x = 0.71 $ $ x = 5 $
4. 求下面各图形的面积。(单位:cm)(每题 3★)
答案
(1) $ 20 × 8 + 20 × 4 = 240 ( cm ^ { 2 } ) $
(2) $ ( 120 + 180 ) × 60 ÷ 2 = 9000 ( cm ^ { 2 } ) $
(2) $ ( 120 + 180 ) × 60 ÷ 2 = 9000 ( cm ^ { 2 } ) $
