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三、口算。
$10+2=$
$5+10=$
$14+3=$
$10+8=$
$6+10=$
$19-1=$
$12+6=$
$14-4=$
$10+1=$
$14-3=$
$16-6=$
$17-1=$
$10+9=$
$12-2=$
$15-4=$
$10+6=$
$9+10=$
$15+4=$
$12-10=$
$10+3=$
$8+10=$
$13-10=$
$15-3=$
$19-3=$
$18-10=$
$18-2=$
$14+4=$
$16-10=$
$17-6=$
$16-4=$
$1+10=$
$16+3=$
$11-10=$
$14-2=$
$16+2=$
$19-9=$
$15-2=$
$2+17=$
$18-3=$
$10+2=$
$5+10=$
$14+3=$
$10+8=$
$6+10=$
$19-1=$
$12+6=$
$14-4=$
$10+1=$
$14-3=$
$16-6=$
$17-1=$
$10+9=$
$12-2=$
$15-4=$
$10+6=$
$9+10=$
$15+4=$
$12-10=$
$10+3=$
$8+10=$
$13-10=$
$15-3=$
$19-3=$
$18-10=$
$18-2=$
$14+4=$
$16-10=$
$17-6=$
$16-4=$
$1+10=$
$16+3=$
$11-10=$
$14-2=$
$16+2=$
$19-9=$
$15-2=$
$2+17=$
$18-3=$
答案
1.12 2.10 3.18 4.15 5.11 6.6 7.17 8.16 9.11 10.18 11.19 12.12 13.16 14.19 15.11 16.18 17.2 18.19 19.18 20.13 21.1 22.10 23.18 24.12 25.11 26.3 27.18 28.11 29.12 30.10 31.10 32.16 33.13 34.16 35.8 36.19 37.19 38.16 39.15
四、在$□$里填合适的数，使“花瓣”上算式的得数等于“花”中心的数。
答案
1.18 2.13 3.7 4.15 5.2 6.4 7.5 8.11 9.13 10.3
