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1. 直接写出得数。(每题1★)
$60×0.05= $ $2.5×12= $ $61+39= $ $168÷28= $
$1.25×40= $ $1.5+2.5= $ $56÷14= $ $2.3×100= $
$45÷0.1= $ $2.5+2.7= $ $5.4÷0.6= $ $0.3÷5= $
$4×2.4= $ $2.8÷0.04= $ $12×2= $ $26×8= $
$60×0.05= $ $2.5×12= $ $61+39= $ $168÷28= $
$1.25×40= $ $1.5+2.5= $ $56÷14= $ $2.3×100= $
$45÷0.1= $ $2.5+2.7= $ $5.4÷0.6= $ $0.3÷5= $
$4×2.4= $ $2.8÷0.04= $ $12×2= $ $26×8= $
答案
3 30 100 6 50 4 4 230 450 5.2 9 0.06 9.6 70 24 208
2. 计算下面各题,能简算的要简算。(每题3★)
$0.169×101$ $0.4×89×250$ $56.5×6.8+43.5×6.8$
$720÷12.5÷8$ $(1-0.2)÷(1-0.84)$ $0.23×4+(1.08+0.69)×4$
$0.169×101$ $0.4×89×250$ $56.5×6.8+43.5×6.8$
$720÷12.5÷8$ $(1-0.2)÷(1-0.84)$ $0.23×4+(1.08+0.69)×4$
答案
17.069 8900 680 7.2 5 8
3. 计算下面各图形的棱长和。(每题4★)
答案
(1)$(12+8+10)×4=120(cm)$
(2)$9×12=108(dm)$
(2)$9×12=108(dm)$
