用简便方法计算.72×53+41×24?
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解题思路:(1)把72分解成24×3,使原式变为24×3×53+41×24,再利用乘法分配律计算;
(2)把9810分解成981×10,然后再利用乘法分配律进行计算.
(1)72×53+41×24
=24×3×53+41×24,
=24×159+41×24,
=24×(159+41),
=24×200,
=4800;
(2)981+5×9810+49×981
=981+5×981×10+49×981,
=981×(1+50+49),
=981×100,
=98100.
,5,981+5×9810+49×981
=981+50×981+49×981
=981×(1+50+49)
=981*100
=98100,2,原式=981*1+981*5*10+981*49
=981*(1+50+49)
=981*100
=98100,2,981+5×9810+49×981
=981+50×981+49×981
=981×(1+50+49)
=981×100
=98100,2,981+5×9810+49×981=981*(1+50+49)
=981*100=98100,0,981*(1+5*10+49),0,用简便方法计算.
72×53+41×24
981+5×9810+49×981.
(2)把9810分解成981×10,然后再利用乘法分配律进行计算.
(1)72×53+41×24
=24×3×53+41×24,
=24×159+41×24,
=24×(159+41),
=24×200,
=4800;
(2)981+5×9810+49×981
=981+5×981×10+49×981,
=981×(1+50+49),
=981×100,
=98100.
,5,981+5×9810+49×981
=981+50×981+49×981
=981×(1+50+49)
=981*100
=98100,2,原式=981*1+981*5*10+981*49
=981*(1+50+49)
=981*100
=98100,2,981+5×9810+49×981
=981+50×981+49×981
=981×(1+50+49)
=981×100
=98100,2,981+5×9810+49×981=981*(1+50+49)
=981*100=98100,0,981*(1+5*10+49),0,用简便方法计算.
72×53+41×24
981+5×9810+49×981.
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