问题
解答题
128×25-569.
答案
128×25-569,
=(100+4×7)×25-569,
=100×25+4×25×7-569,
=2500+700-500-69,
=(2500-500)+(700-69),
=2000+631,
=2631.
128×25-569.
128×25-569,
=(100+4×7)×25-569,
=100×25+4×25×7-569,
=2500+700-500-69,
=(2500-500)+(700-69),
=2000+631,
=2631.