
下列各题怎样简便就怎样计算(1)75-25÷715-17; (2)(50×49×48)÷(16×15×14);(3)4.06×1
下列各题怎样简便就怎样计算(1)75-25÷715-17;(2)(50×49×48)÷(16×15×14);(3)4.06×125%+7.36÷45-0.142×12.5...
下列各题怎样简便就怎样计算(1)75-25÷715-17; (2)(50×49×48)÷(16×15×14);(3)4.06×125%+7.36÷45-0.142×12.5; (4)12+15+18+111+120+140+1110.
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(1)
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×
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-1
=
(2)(50×49×48)÷(16×15×14)
=(50÷15)×(49÷14)×(48÷16)
=
×
×3
=35
(3)4.06×125%+7.36÷
-0.142×12.5
=4.06×1.25+7.36×1.25-1.42×1.25
=(4.06+7.36-1.42)×1.25
=10×1.25
=12.5
(4)
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7 |
5 |
2 |
5 |
7 |
15 |
1 |
7 |
=
7 |
5 |
2 |
5 |
15 |
7 |
1 |
7 |
=
7 |
5 |
6 |
7 |
1 |
7 |
=
7 |
5 |
6 |
7 |
1 |
7 |
=
7 |
5 |
=
2 |
5 |
(2)(50×49×48)÷(16×15×14)
=(50÷15)×(49÷14)×(48÷16)
=
10 |
3 |
7 |
2 |
=35
(3)4.06×125%+7.36÷
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5 |
=4.06×1.25+7.36×1.25-1.42×1.25
=(4.06+7.36-1.42)×1.25
=10×1.25
=12.5
(4)
1 |
2 |
1 |
5 |
1 |
8 |
1 |
11 |
1 |
20 |
1 |
40 |
1 |
110 |
=(
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2 |
1 |
5 |
1 |
11 |
1 |
110 |