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一、口算。
$990÷33=$
$806÷2=$
$99+21=$
$82×50=$
$68+24=$
$630÷21=$
$480÷12=$
$500×16=$
$990÷33=$
30
$600÷12=$50
$125×6=$750
$806÷2=$
403
$4400÷40=$110
$43+325=$368
$99+21=$
120
$7×34=$238
$72+79=$151
$82×50=$
4100
$145-36=$109
$450×6=$2700
$68+24=$
92
$2400÷80=$30
$80×15=$1200
$630÷21=$
30
$810-360=$450
$280+40=$320
$480÷12=$
40
$402-32=$370
$720÷4=$180
$500×16=$
8000
$5×131=$655
$32+234=$266
答案
30 50 750 403 110 368 120 238 151 4100 109 2700 92 30 1200 30 450 320 40 370 180 8000 655 266
二、计算下面各题,怎样简便就怎样计算。
$122-144÷12+35$ $19+(253-22)÷21$ $481×101-481$
$(874+836)÷(19×3)$ $560÷[720÷(35+55)]$ $36+189+4×66$
$122-144÷12+35$ $19+(253-22)÷21$ $481×101-481$
$(874+836)÷(19×3)$ $560÷[720÷(35+55)]$ $36+189+4×66$
答案
145 30 48100 30 70 489
解析
122-144÷12+35
=122-12+35
=110+35
=145
19+(253-22)÷21
=19+231÷21
=19+11
=30
481×101-481
=481×(101-1)
=481×100
=48100
(874+836)÷(19×3)
=1710÷57
=30
560÷[720÷(35+55)]
=560÷[720÷90]
=560÷8
=70
36+189+4×66
=36+189+264
=36+264+189
=300+189
=489
=122-12+35
=110+35
=145
19+(253-22)÷21
=19+231÷21
=19+11
=30
481×101-481
=481×(101-1)
=481×100
=48100
(874+836)÷(19×3)
=1710÷57
=30
560÷[720÷(35+55)]
=560÷[720÷90]
=560÷8
=70
36+189+4×66
=36+189+264
=36+264+189
=300+189
=489
