1. 自行车和轿车共有10辆,共有28个车轮,那么自行车和轿车各有多少辆?
答案
轿车:(28-2×10)÷(4-2)=4(辆)
自行车:10-4=6(辆)
自行车:10-4=6(辆)
2. 小彬参加环保知识竞赛,共20道题,规定答对一道题得5分,答错一道题倒扣3分(不答按答错计算),小彬这次环保知识竞赛得了68分。
(1)小彬答错了几道题?
(2)小彬答对了几道题?
(1)小彬答错了几道题?
(2)小彬答对了几道题?
答案
(1)(20×5-68)÷(5+3)=4(道)
(2)20-4=16(道)
(2)20-4=16(道)
算一算
5.43 + 2.26 =
804 ÷ 2 =
12 × 40 =
60 × 13 =
390 + 10 =
14.1 + 3.65 =
4.5 + 2.3 =
0.9 + 6.2 =
7.7 - 5.5 =
24 + 19 =
5.43 + 2.26 =
804 ÷ 2 =
12 × 40 =
60 × 13 =
390 + 10 =
14.1 + 3.65 =
4.5 + 2.3 =
0.9 + 6.2 =
7.7 - 5.5 =
24 + 19 =
答案
5.43 + 2.26 = 7.69
804 ÷ 2 = 402
12 × 40 = 480
60 × 13 = 780
390 + 10 = 400
14.1 + 3.65 = 17.75
4.5 + 2.3 = 6.8
0.9 + 6.2 = 7.1
7.7 - 5.5 = 2.2
24 + 19 = 43
804 ÷ 2 = 402
12 × 40 = 480
60 × 13 = 780
390 + 10 = 400
14.1 + 3.65 = 17.75
4.5 + 2.3 = 6.8
0.9 + 6.2 = 7.1
7.7 - 5.5 = 2.2
24 + 19 = 43
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