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脱式计算.2×(40+60÷15)(15×40+60)÷15280+840÷24×5402-170-(169-135)480÷80+42×17500-(320+320÷4)236-(143+47)×2720-640÷(92-12)
题目详情
脱式计算.
2×(40+60÷15) | (15×40+60)÷15 |
280+840÷24×5 | 402-170-(169-135) |
480÷80+42×17 | 500-(320+320÷4) |
236-(143+47)×2 | 720-640÷(92-12) |
▼优质解答
答案和解析
(1)2×(40+60÷15)
=2×(40+4)
=2×44
=88;
(2)(15×40+60)÷15
=(600+60)÷15
=660÷15
=44;
(3)280+840÷24×5
=280+35×5
=280+175
=455;
(4)402-170-(169-135)
=402-170-34
=232-34
=198;
(5)480÷80+42×17
=6+714
=720;
(6)500-(320+320÷4)
=500-(320+80)
=500-400
=100;
(7)236-(143+47)×2
=236-190×2
=236-380
=-144;
(8)720-640÷(92-12)
=720-640÷80
=720-8
=712.
=2×(40+4)
=2×44
=88;
(2)(15×40+60)÷15
=(600+60)÷15
=660÷15
=44;
(3)280+840÷24×5
=280+35×5
=280+175
=455;
(4)402-170-(169-135)
=402-170-34
=232-34
=198;
(5)480÷80+42×17
=6+714
=720;
(6)500-(320+320÷4)
=500-(320+80)
=500-400
=100;
(7)236-(143+47)×2
=236-190×2
=236-380
=-144;
(8)720-640÷(92-12)
=720-640÷80
=720-8
=712.
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