递等式计算,能简便运算的要用简便计算方法计算. 800×84-24030÷270 13.5×537+1312×347+13.
递等式计算,能简便运算的要用简便计算方法计算.800×84-24030÷27013.5×537+1312×347+13.512.2+3.05×(512-1.75×217)...
递等式计算,能简便运算的要用简便计算方法计算. 800×84-24030÷270 13.5×537+1312×347+13.5 12.2+3.05×(512-1.75×217) 512×[(914-8.05+25)÷315].
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(1)800×84-24030÷270,
=67200-89,
=67111;
(2)13.5×5
3 |
7 |
1 |
2 |
4 |
7 |
=13.5×5
3 |
7 |
4 |
7 |
=13.5×(5
3 |
7 |
4 |
7 |
=13.5×10,
=135;
(3)12.2+3.05×(5
1 |
2 |
1 |
7 |
=12.2+3.05×(5
1 |
2 |
=12.2+3.05×1.75,
=12.2+5.3375,
=17.5375;
(4)5
1 |
2 |
1 |
4 |
2 |
5 |
1 |
5 |
=5
1 |
2 |
2 |
5 |
1 |
5 |
=5
1 |
2 |
1 |
5 |
=5
1 |
2 |
=2.75.
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