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用简便方法计算.355+260+140+245987-(287+135)89×99+891050÷15÷7.
题目详情
用简便方法计算.
355+260+140+245
987-(287+135)
89×99+89
1050÷15÷7.
355+260+140+245
987-(287+135)
89×99+89
1050÷15÷7.
▼优质解答
答案和解析
(1)355+260+140+245,
=(355+245)+(260+140),
=600+400,
=1000;
(2)987-(287+135),
=987-287-135,
=700-135,
=565;
(3)89×99+89,
=89×(99+1),
=89×100,
=8900;
(4)1050÷15÷7,
=1050÷(15×7),
=1050÷105,
=10.
=(355+245)+(260+140),
=600+400,
=1000;
(2)987-(287+135),
=987-287-135,
=700-135,
=565;
(3)89×99+89,
=89×(99+1),
=89×100,
=8900;
(4)1050÷15÷7,
=1050÷(15×7),
=1050÷105,
=10.
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