Fifth grade volume I mathematics Huanggang little champion Volume I page 57 The problem is to find the area of the shadow in the following figure The problem is to find the area of the shadow in the following figure The first figure is a parallelogram. Its top bottom is 5cm, and the triangle without coloring is 3.6cm high. Its bottom is 3cm, and the shadow part is calculated.

Title?

Seventeen soldiers want to cross the river by boat. There is only one boat (without boatman) that can carry five people at the ferry. How many times do they have to use this boat to cross the river at least? (one round trip each)

(17-5) △ 4 × 2 + 1, = 12 △ 4 × 2 + 1, = 3 × 2 + 1, = 7 (Times); answer: at least use this boat to cross the river for 7 times

Fourth grade volume 2 answers to Huang Gang's little champion in Mathematics

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