用简便方法计算:304×22; 48×101-48; (30+2)×15

用简便方法计算:304×22; 48×101-48; (30+2)×15.

(1)304×22,
=(300+4)×22,
=300×22+4×22,
=6600+88,
=6688;

(2)48×101-48,
=48×(101-1),
=48×100,
=4800;

(3)(30+2)×15,
=30×15+2×15,
=450+30,
=480.
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