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