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用简便方法计算23×7+23×31462-369-6313000÷125÷8135×9949×99+49125×32×25
题目详情
用简便方法计算
23×7+23×3 | 1462-369-631 | 3000÷125÷8 |
135×99 | 49×99+49 | 125×32×25 |
▼优质解答
答案和解析
(1)23×7+23×3
=23×(7+3)
=23×10
=230;
(2)1462-369-631
=1462-(369+631)
=1462-1000
=462;
(3)3000÷125÷8
=3000÷(125×8)
=3000÷1000
=3;
(4)135×99
=135×(100-1)
=135×100-135×1
=13500-135
=13365;
(5)49×99+49
=49×(99+1)
=49×100
=4900;
(6)125×32×25
=125×(4×8)×25
=(125×8)×(4×25)
=1000×100
=100000.
=23×(7+3)
=23×10
=230;
(2)1462-369-631
=1462-(369+631)
=1462-1000
=462;
(3)3000÷125÷8
=3000÷(125×8)
=3000÷1000
=3;
(4)135×99
=135×(100-1)
=135×100-135×1
=13500-135
=13365;
(5)49×99+49
=49×(99+1)
=49×100
=4900;
(6)125×32×25
=125×(4×8)×25
=(125×8)×(4×25)
=1000×100
=100000.
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