一、口算。
$4000÷8= $
$740÷20= $
$376+99= $
$125×40= $
$125+44= $
$5×24= $
$378+22= $
$390÷13= $
$4000÷8= $
500
$236÷4= $59
$17×40= $680
$740÷20= $
37
$8×45= $360
$202-108= $94
$376+99= $
475
$125÷5= $25
$228+56= $284
$125×40= $
5000
$54-37= $17
$25×80= $2000
$125+44= $
169
$130÷26= $5
$16×60= $960
$5×24= $
120
$240÷12= $20
$205+205= $410
$378+22= $
400
$15×80= $1200
$65×6= $390
$390÷13= $
30
$126÷6= $21
$50×40= $2000
答案
一、500 59 680
37 360 94
475 25 284
5000 17 2000
169 5 960
120 20 410
400 1200 390
30 21 2000
37 360 94
475 25 284
5000 17 2000
169 5 960
120 20 410
400 1200 390
30 21 2000
二、计算下面组合图形的面积。


答案
二、$50×40-(20+30)×12÷2=1700(dm^{2})$
$40×30+(40+60)×(50-30)÷2=2200(m^{2})$
$40×30+(40+60)×(50-30)÷2=2200(m^{2})$
登录