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第55页

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$9.99$

$0.046$

$1.5$

$0.8$

$0.17$

$2.86$

$1.2$

$0.39$

=(7.48+0.52)-(1.32+2.68)

= $4$

=3.05÷(2.5×4)

= $0.305$

=38.4×(10.1-0.1) 

=$384$

=36.6÷(0.4×1.5)

= $61$

=15.05

=13.93

=2.623

≈0.21

3.2×2.8+(4−2.8)×(3.2−1)÷2 =10.28(cm²)

(42−7)×18÷2=315(cm²)

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