题目内容
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÷(34+36)] | 125×(8×2)+100 | 125×88 |
230×24+240×77 | 46×101-146 | (841-41)÷25×4. |
分析:(1)先算除法和乘法,再算减法;
(2)先算括号内的除法,再算括号内的减法,最后算括号外的乘法;
(3)先算除法和乘法,再算加法;
(4)先算小括号内的,再算中括号内的,最后算括号外的;
(5)去括号,运用乘法结合律简算;
(6)把88看算8×11,运用乘法结合律简算;
(7)根据数字特点,把原式变为23×240+240×77,运用乘法分配律简算;
(8)把101看做100+1,运用乘法分配律简算,然后运用减法的性质简算;
(9)先算括号内的,再算括号外的除法和乘法.
(2)先算括号内的除法,再算括号内的减法,最后算括号外的乘法;
(3)先算除法和乘法,再算加法;
(4)先算小括号内的,再算中括号内的,最后算括号外的;
(5)去括号,运用乘法结合律简算;
(6)把88看算8×11,运用乘法结合律简算;
(7)根据数字特点,把原式变为23×240+240×77,运用乘法分配律简算;
(8)把101看做100+1,运用乘法分配律简算,然后运用减法的性质简算;
(9)先算括号内的,再算括号外的除法和乘法.
解答:解:(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.
=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.
点评:此题主要考查整数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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