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一、口算。
$7.2 + 0.72 = $
$10 - 0.01 = $
$1.4 + 0.46 = $
$14.8 + 2.2 = $
$1.82 - 0.63 = $
$9.8 - 0.98 = $
$12.6 + 7.08 = $
$8.89 + 0.1 = $
$4.3 - 0.25 = $
$7.2 + 4.8 = $
$7.2 + 0.72 = $
7.92
$9.87 - 9.12 = $0.75
$2.03 + 3.7 = $5.73
$10 - 0.01 = $
9.99
$0.01 + 10.99 = $11
$13.9 - 3.9 = $10
$1.4 + 0.46 = $
1.86
$0.8 - 0.35 = $0.45
$5.9 - 5 = $0.9
$14.8 + 2.2 = $
17
$2.5 + 1.37 = $3.87
$9.1 - 3.2 = $5.9
$1.82 - 0.63 = $
1.19
$1.06 + 3.4 = $4.46
$0.9 + 2.11 = $3.01
$9.8 - 0.98 = $
8.82
$2.1 - 1.08 = $1.02
$2.2 + 9.1 = $11.3
$12.6 + 7.08 = $
19.68
$6.68 - 1.5 = $5.18
$7.82 - 7.2 = $0.62
$8.89 + 0.1 = $
8.99
$0.81 - 0.5 = $0.31
$5.4 - 0.6 = $4.8
$4.3 - 0.25 = $
4.05
$0.8 + 0.82 = $1.62
$0.66 + 0.64 = $1.3
$7.2 + 4.8 = $
12
$12.6 - 0.8 = $11.8
$6.3 + 0.67 = $6.97
答案
一、7.92 0.75 5.73 9.99 11 10 1.86 0.45 0.9 17 3.87 5.9 1.19 4.46 3.01 8.82 1.02 11.3 19.68 5.18 0.62 8.99 0.31 4.8 4.05 1.62 1.3 12 11.8 6.97
二、计算下面图形的面积。
答案
二、$8×8÷2=32(m^{2})$ $(3+3+2)×3÷2=12(m^{2})$
解析
解：
第一个图形面积：$8×8÷2=32(m^{2})$
第二个图形面积：$(3+3+2)×3÷2=12(m^{2})$
第一个图形面积：$8×8÷2=32(m^{2})$
第二个图形面积：$(3+3+2)×3÷2=12(m^{2})$
