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①6.5×8+3.5×8-44②907+907×9③(999+111)÷[56×(37-38)]④56×99⑤168.1÷(4.3×2-0.4)⑥[2-(11.9-8.4×113)]÷1.3.

题目详情
①6.5×8+3.5×8-44 ②907+907×9 ③(999+111)÷[56×(
3
7
-
3
8
)]
④56×99 ⑤168.1÷(4.3×2-0.4) ⑥[2-(11.9-8.4×1
1
3
)]÷1.3.
▼优质解答
答案和解析
①6.5×8+3.5×8-44                   
=(6.5+3.5)×8-44
=10×8-44
=80-44
=36;
 ②907+907×9 
=907×(1+9)
=907×10 
=9070;
 ③(999+111)÷[56×(
3
7
-
3
8
)]
=1110÷[56×
3
56
]
=1110÷3
=370;
④56×99
=56×(100-1)
=56×100-56×1
=5600-56
=5544;
  ⑤168.1÷(4.3×2-0.4)
=168.1÷(8.6-0.4)
=168.1÷8.2                                           
=20.5;
⑥[2-(11.9-8.4×1
1
3
)]÷1.3
=[2-(11.9-
42
5
×
4
3
)]÷1.3
=[2-(11.9-11.2)]÷1.3
=[2-0.7]÷1.3
=1.3÷1.3
=1.