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一、口算。
$800 - 12 = $
$256 ÷ 4 = $
$72 × 6 = $
$505 ÷ 5 = $
$180 × 5 = $
$900 ÷ 60 = $
$350 - 35 = $
$217 + 733 = $
$920 ÷ 4 = $
$43 × 30 = $
$750 ÷ 25 = $
$360 ÷ 15 = $
$187 × 20 = $
$305 - 25 = $
$204 × 5 = $
$470 + 70 = $
$21 × 8 = $
$214 + 76 = $
$545 + 55 = $
$3200 ÷ 16 = $
$34 + 28 = $
$810 ÷ 45 = $
$27 × 40 = $
$303 × 3 = $
$800 - 12 = $
788
$256 ÷ 4 = $
64
$72 × 6 = $
432
$505 ÷ 5 = $
101
$180 × 5 = $
900
$900 ÷ 60 = $
15
$350 - 35 = $
315
$217 + 733 = $
950
$920 ÷ 4 = $
230
$43 × 30 = $
1290
$750 ÷ 25 = $
30
$360 ÷ 15 = $
24
$187 × 20 = $
3740
$305 - 25 = $
280
$204 × 5 = $
1020
$470 + 70 = $
540
$21 × 8 = $
168
$214 + 76 = $
290
$545 + 55 = $
600
$3200 ÷ 16 = $
200
$34 + 28 = $
62
$810 ÷ 45 = $
18
$27 × 40 = $
1080
$303 × 3 = $
909
答案
一、788 64 432 101 900 15 315 950 230 1290 30 24 3740 280 1020 540 168 290 600 200 62 18 1080 909
二、计算下面各题,怎样简便就怎样计算。
$478 - 145 ÷ 5 × 6$
$50 + 129 × 28 - 42$
$185 × 38 + 15 × 38$
$115 × (244 - 220) ÷ 40$
$1000 - (560 ÷ 7 + 99)$
$85 × 25 × 2 × 4$
$478 - 145 ÷ 5 × 6$
$50 + 129 × 28 - 42$
$185 × 38 + 15 × 38$
$115 × (244 - 220) ÷ 40$
$1000 - (560 ÷ 7 + 99)$
$85 × 25 × 2 × 4$
答案
二、304 3620 7600 69 821 17000
解析
$478 - 145 ÷ 5 × 6$
$=478 - 29×6$
$=478 - 174$
$=304$
$50 + 129 × 28 - 42$
$=50 + 3612 - 42$
$=3662 - 42$
$=3620$
$185 × 38 + 15 × 38$
$=(185 + 15)×38$
$=200×38$
$=7600$
$115 × (244 - 220) ÷ 40$
$=115×24÷40$
$=2760÷40$
$=69$
$1000 - (560 ÷ 7 + 99)$
$=1000 - (80 + 99)$
$=1000 - 179$
$=821$
$85 × 25 × 2 × 4$
$=85×2×(25×4)$
$=170×100$
$=17000$
$=478 - 29×6$
$=478 - 174$
$=304$
$50 + 129 × 28 - 42$
$=50 + 3612 - 42$
$=3662 - 42$
$=3620$
$185 × 38 + 15 × 38$
$=(185 + 15)×38$
$=200×38$
$=7600$
$115 × (244 - 220) ÷ 40$
$=115×24÷40$
$=2760÷40$
$=69$
$1000 - (560 ÷ 7 + 99)$
$=1000 - (80 + 99)$
$=1000 - 179$
$=821$
$85 × 25 × 2 × 4$
$=85×2×(25×4)$
$=170×100$
$=17000$
