计算下面各题.(能简算的要简算)(1)(12.5×8-40)÷0.6 (2)7.25×16.3-12.3×7.25 (3)(78+3
计算下面各题.(能简算的要简算)(1)(12.5×8-40)÷0.6(2)7.25×16.3-12.3×7.25(3)(78+34)÷18(4)91+91×(213?17...
计算下面各题.(能简算的要简算)(1)(12.5×8-40)÷0.6 (2)7.25×16.3-12.3×7.25 (3)(78+34)÷18 (4)91+91×(213?17) (5)5.2×101 (6)14.6-3.625-6.375.
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(1)(12.5×8-40)÷0.6,
=(100-40)÷0.6,
=60÷0.6,
=100;
(2)7.25×16.3-12.3×7.25,
=(16.3-12.3)×7.25,
=4×7.25,
=4×(7+0.25),
=28+1,
=29;
(3)(
+
)÷
,
=
×8,
=13;
(4)91+91×(
-
),
=91+91×
-91×
,
=91+14-13,
=92;
(5)5.2×101,
=5.2×(100+1),
=520+5.2,
=525.2;
(6)14.6-3.625-6.375,
=14.6-(3.625+6.375),
=14.6-10,
=4.6.
=(100-40)÷0.6,
=60÷0.6,
=100;
(2)7.25×16.3-12.3×7.25,
=(16.3-12.3)×7.25,
=4×7.25,
=4×(7+0.25),
=28+1,
=29;
(3)(
7 |
8 |
3 |
4 |
1 |
8 |
=
13 |
8 |
=13;
(4)91+91×(
2 |
13 |
1 |
7 |
=91+91×
2 |
13 |
1 |
7 |
=91+14-13,
=92;
(5)5.2×101,
=5.2×(100+1),
=520+5.2,
=525.2;
(6)14.6-3.625-6.375,
=14.6-(3.625+6.375),
=14.6-10,
=4.6.
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