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Primary school mathematics fifth grade volume 1 supplementary exercise 6 pages all the answers.
1.s=ah3×5= 15 (square centimeter) s=ah2×9= 18 (square centimeter)

leave out

3.108×18 =1944 (square meters) 1944÷9=2 16 (tree)

4.40×20÷2÷800÷2=400 (square centimeter)