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一、口算。
$94 - 49 = $
$150 × 7 = $
$280 ÷ 8 = $
$23 × 80 = $
$75 × 80 = $
$780 ÷ 26 = $
$20 + 85 = $
$380 ÷ 20 = $
$94 - 49 = $
45
$608 ÷ 4 = $152
$850 + 15 - 63 = $802
$150 × 7 = $
1050
$85 × 6 = $510
$757 - 476 - 124 = $157
$280 ÷ 8 = $
35
$106 + 61 = $167
$300 ÷ 25 ÷ 4 = $3
$23 × 80 = $
1840
$307 + 173 = $480
$240 ÷ 30 × 20 = $160
$75 × 80 = $
6000
$258 - 68 = $190
$18 × 10 + 25 = $205
$780 ÷ 26 = $
30
$550 ÷ 50 = $11
$125 × 3 × 8 = $3000
$20 + 85 = $
105
$150 - 70 = $80
$12 × (80 ÷ 16) = $60
$380 ÷ 20 = $
19
$131 × 4 = $524
$(144 - 120) ÷ 12 = $2
答案
一、45 152 802 1050 510 157 35 167 3 1840 480 160 6000 190 205 30 11 3000 105 80 60 19 524 2
二、计算下面各题,怎样简便就怎样计算。
$206 × (39 ÷ 13 × 4)$ $690 + 47 × 52 - 398$ $(236 + 45) × (96 - 82)$
$630 ÷ 42$ $98 × 101 - 49 × 2$ $2028 ÷ [(890 - 734) ÷ 4]$
$206 × (39 ÷ 13 × 4)$ $690 + 47 × 52 - 398$ $(236 + 45) × (96 - 82)$
$630 ÷ 42$ $98 × 101 - 49 × 2$ $2028 ÷ [(890 - 734) ÷ 4]$
答案
二、2472 2736 3934 15 9800 52
解析
$206×(39÷13×4)$
$=206×(3×4)$
$=206×12$
$=2472$
$690 + 47×52 - 398$
$=690 + 2444 - 398$
$=3134 - 398$
$=2736$
$(236 + 45)×(96 - 82)$
$=281×14$
$=3934$
$630÷42$
$=630÷7÷6$
$=90÷6$
$=15$
$98×101 - 49×2$
$=98×101 - 98×1$
$=98×(101 - 1)$
$=98×100$
$=9800$
$2028÷[(890 - 734)÷4]$
$=2028÷[156÷4]$
$=2028÷39$
$=52$
$=206×(3×4)$
$=206×12$
$=2472$
$690 + 47×52 - 398$
$=690 + 2444 - 398$
$=3134 - 398$
$=2736$
$(236 + 45)×(96 - 82)$
$=281×14$
$=3934$
$630÷42$
$=630÷7÷6$
$=90÷6$
$=15$
$98×101 - 49×2$
$=98×101 - 98×1$
$=98×(101 - 1)$
$=98×100$
$=9800$
$2028÷[(890 - 734)÷4]$
$=2028÷[156÷4]$
$=2028÷39$
$=52$
