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一、口算。
$850÷50=$
$450+450=$
$90×70=$
$77+37=$
$340÷17=$
$200-124=$
$37÷37=$
$4800÷600=$
$850÷50=$
17
$18×40=$720
$44×2=$88
$450+450=$
900
$410×2=$820
$900÷30=$30
$90×70=$
6300
$400÷50=$8
$14×30=$420
$77+37=$
114
$20×43=$860
$550÷2=$275
$340÷17=$
20
$210÷30=$7
$800-250=$550
$200-124=$
76
$110×6=$660
$420÷21=$20
$37÷37=$
1
$360÷30=$12
$24×40=$960
$4800÷600=$
8
$80×55=$4400
$250-25=$225
答案
一、17 720 88 900 820 30 6300 8 420 114 860 275 20 7 550 76 660 20 1 12 960 8 4400 225
二、计算下面各题。
$(45+139)×4-528$ $46×(210-195)÷30$ $257+(950-50)÷36$
$812-700÷(9+16)$ $2800÷25×4+80$ $720÷[(204-189)×4]$
$(45+139)×4-528$ $46×(210-195)÷30$ $257+(950-50)÷36$
$812-700÷(9+16)$ $2800÷25×4+80$ $720÷[(204-189)×4]$
答案
二、208 23 282 784 528 12
解析
(45+139)×4-528
=184×4-528
=736-528
=208
46×(210-195)÷30
=46×15÷30
=690÷30
=23
257+(950-50)÷36
=257+900÷36
=257+25
=282
812-700÷(9+16)
=812-700÷25
=812-28
=784
2800÷25×4+80
=112×4+80
=448+80
=528
720÷[(204-189)×4]
=720÷[15×4]
=720÷60
=12
=184×4-528
=736-528
=208
46×(210-195)÷30
=46×15÷30
=690÷30
=23
257+(950-50)÷36
=257+900÷36
=257+25
=282
812-700÷(9+16)
=812-700÷25
=812-28
=784
2800÷25×4+80
=112×4+80
=448+80
=528
720÷[(204-189)×4]
=720÷[15×4]
=720÷60
=12
