问题
解答题
用递等式计算
128+840÷6
420-400÷5
(270-180)×7
2400÷(3+2).
答案
(1)128+840÷6,
=128+140,
=268;
(2)420-400÷5,
=420-80,
=340;
(3)(270-180)×7,
=90×7,
=630;
(4)2400÷(3+2),
=2400÷5,
=480.
用递等式计算
128+840÷6
420-400÷5
(270-180)×7
2400÷(3+2).
(1)128+840÷6,
=128+140,
=268;
(2)420-400÷5,
=420-80,
=340;
(3)(270-180)×7,
=90×7,
=630;
(4)2400÷(3+2),
=2400÷5,
=480.