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计算下列各题,能简便的要简便.①0.25×4.78×4②65×201③17×23-23×7.

题目详情
计算下列各题,能简便的要简便.
①0.25×4.78×4
②65×201
③17×23-23×7.
▼优质解答
答案和解析
①0.25×4.78×4,
=0.25×4×4.78,
=1×4.78,
=4.78;

②65×201,
=65×(200+1),
=65×200+65×1,
=1300+65,
=1365;

③17×23-23×7,
=(17-7)×23,
=10×23,
=230.