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一、口算。
$85×40=
$502×2=
$430 + 80=
$19×200=
$600÷15=
$600 + 300=
$440 - 120=
$906÷6=
$85×40=
3400
$ $770 - 180=590
$ $540 - 38=502
$$502×2=
1004
$ $390 + 11=401
$ $240÷20=12
$$430 + 80=
510
$ $21×40=840
$ $3000 + 500=3500
$$19×200=
3800
$ $450 - 36=414
$ $480÷8=60
$$600÷15=
40
$ $3000÷600=5
$ $4×203=812
$$600 + 300=
900
$ $320÷16=20
$ $140×3=420
$$440 - 120=
320
$ $900×60=54000
$ $1300 - 800=500
$$906÷6=
151
$ $800÷5=160
$ $95×2=190
$答案
一、3400 590 502 1004 401 12 510 840 3500 3800 414 60 40 5 812 900 20 420 320 54000 500 151 160 190
二、计算下面各题,怎样简便就怎样计算。
$125×(8×4)×5$ $34 + 828÷23 - 48$ $(1369 - 37)÷37 - 32$
$250×24$ $160÷(22 - 12)×22$ $420÷[(205 - 198)×4]$
$125×(8×4)×5$ $34 + 828÷23 - 48$ $(1369 - 37)÷37 - 32$
$250×24$ $160÷(22 - 12)×22$ $420÷[(205 - 198)×4]$
答案
二、20000 22 4 6000 352 15
解析
125×(8×4)×5
=(125×8)×(4×5)
=1000×20
=20000
34 + 828÷23 - 48
=34 + 36 - 48
=70 - 48
=22
(1369 - 37)÷37 - 32
=1332÷37 - 32
=36 - 32
=4
250×24
=250×4×6
=1000×6
=6000
160÷(22 - 12)×22
=160÷10×22
=16×22
=352
420÷[(205 - 198)×4]
=420÷[7×4]
=420÷28
=15
=(125×8)×(4×5)
=1000×20
=20000
34 + 828÷23 - 48
=34 + 36 - 48
=70 - 48
=22
(1369 - 37)÷37 - 32
=1332÷37 - 32
=36 - 32
=4
250×24
=250×4×6
=1000×6
=6000
160÷(22 - 12)×22
=160÷10×22
=16×22
=352
420÷[(205 - 198)×4]
=420÷[7×4]
=420÷28
=15
