2.41+16.95-12.41简便计算
用简便方法计算.(1)42×98+42×2(2)41×49-49(3)(4)5×34×4(5)(125×12)×8(6)700÷25÷4.72×102....
用简便方法计算.
(1)42×98+42×2
(2)41×49-49
(3)(4)5×34×4
(5)(125×12)×8
(6)700÷25÷4.72×102. 展开
(1)42×98+42×2
(2)41×49-49
(3)(4)5×34×4
(5)(125×12)×8
(6)700÷25÷4.72×102. 展开
1个回答
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(1)42×98+42×2
=42×(98+2)
=42×100
=4200;
(2)41×49-49
=(41-1)×49
=40×49
=1960;
(3)5×34×4
=(5×4)×34
=20×34
=680;
(4)(125×12)×8
=125×8+12×8
=1000+96
=1096;
(5)700÷25÷4
=700÷(25×4)
=700÷100
=7;
(6)72×102
=72×100+72×2
=7200+144
=7344.
=42×(98+2)
=42×100
=4200;
(2)41×49-49
=(41-1)×49
=40×49
=1960;
(3)5×34×4
=(5×4)×34
=20×34
=680;
(4)(125×12)×8
=125×8+12×8
=1000+96
=1096;
(5)700÷25÷4
=700÷(25×4)
=700÷100
=7;
(6)72×102
=72×100+72×2
=7200+144
=7344.
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