简便计算. 101×78 25×88 99×76+76 5×38×4×5 (25+20)×4 35×103-3×3
简便计算.101×7825×8899×76+765×38×4×5(25+20)×435×103-3×35....
简便计算. 101×78 25×88 99×76+76 5×38×4×5 (25+20)×4 35×103-3×35.
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(1)101×78,
=(100+1)×78,
=100×78+78,
=7800+78,
=7878;
(2)25×88,
=25×(4×22),
=(25×4)×22,
=100×22,
=2200;
(3)99×76+76,
=(99+1)×76,
=100×76,
=7600;
(4)5×38×4×5,
=(5×5×4)×38,
=100×38,
=3800;
(5)(25+20)×4,
=25×4+20×4,
=100+80,
=180;
(6)35×103-3×35,
=(103-3)×35,
=100×35,
=3500.
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