脱式计算:(1)92×0.54+435×915(2)4.75×1.36×0.375÷(434×1925×38)(3)13×5+15×7+17×9+19×
脱式计算:(1)92×0.54+435×915(2)4.75×1.36×0.375÷(434×1925×38)(3)13×5+15×7+17×9+19×11+111×13...
脱式计算:(1)92×0.54+435×915(2)4.75×1.36×0.375÷(434×1925×38)(3)13×5+15×7+17×9+19×11+111×13(4)567+345×566567×345+222.
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(1)92×0.54+4
×9
,
=9.2×5.4+4.6×9.2,
=9.2×(5.4+4.6),
=9.2×10,
=92;
(2)4.75×1.36×0.375÷(4
×1
×
),
=(4.75×1.36×0.375)÷(4.75×1.36×0.375),
=1;
(3)
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(4)
,
=
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,
=1.
3 |
5 |
1 |
5 |
=9.2×5.4+4.6×9.2,
=9.2×(5.4+4.6),
=9.2×10,
=92;
(2)4.75×1.36×0.375÷(4
3 |
4 |
9 |
25 |
3 |
8 |
=(4.75×1.36×0.375)÷(4.75×1.36×0.375),
=1;
(3)
1 |
3×5 |
1 |
5×7 |
1 |
7×9 |
1 |
9×11 |
1 |
11×13 |
=(
1 |
3 |
1 |
5 |
1 |
2 |
1 |
5 |
1 |
7 |
1 |
2 |
1 |
7 |
1 |
9 |
1 |
2 |
1 |
9 |
1 |
11 |
1 |
2 |
1 |
11 |
1 |
13 |
1 |
2 |
=(
1 |
3 |
1 |
5 |
1 |
5 |
1 |
7 |
1 |
7 |
1 |
9 |
1 |
9 |
1 |
11 |
1 |
11 |
1 |
13 |
1 |
2 |
=(
1 |
3 |
1 |
13 |
1 |
2 |
=
10 |
39 |
1 |
2 |
=
5 |
39 |
(4)
567+345×566 |
567×345+222 |
=
567+345×(567?1) |
567×345+222 |
=
567+345×567?345 |
567×345+222 |
=
345×567+222 |
345×567+222 |
=1.
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