脱式计算(能简便的用简便方法计算)960-720÷8×9 12×(736-656÷16) 360÷9+3×21 927÷[630÷

2024年11月15日 21:38
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(1)960-720÷8×9,
=960-720÷8÷9,
=960-810,
=150;

(2)12×(736-656÷16),
=12×(736-41),
=12×695,
=12×(700-5),
=12×700-12×5,
=(10+2)×700-60,
=7000+1400-60,
=8340;

(3)360÷9+3×21,
=40+63,
=103;

(4)927÷[630÷(34+36)],
=927÷[630÷70],
=927÷9,
=103;

(5)125×(8×2)+100,
=125×8×2+100,
=1000×2+100,
=2000+100,
=2100;

(6)125×88,
=125×8×11,
=1000×11,
=11000;

(7)230×24+240×77,
=23×240+240×77,
=240×(23+77),
=240×100,
=24000;

(8)46×101-146,
=46×(100+1)-146,
=4600+46-146,
=4600-(146-46),
=4600-100,
=4500;

(9)(841-41)÷25×4,
=800÷25×4,
=8×100÷25×4,
=8×(100÷25)×4,
=8×4×4,
=32×4,
=128.