计算下面各题.(能简算的要简算)(1)24×12+76×12 (2)87.5÷12.5÷8 (3)(78+34)÷18 (4)9
计算下面各题.(能简算的要简算)(1)24×12+76×12(2)87.5÷12.5÷8(3)(78+34)÷18(4)91+91×(213?17)(5)2.2×101(...
计算下面各题.(能简算的要简算)(1)24×12+76×12 (2)87.5÷12.5÷8 (3)(78+34)÷18 (4)91+91×(213?17) (5)2.2×101 (6)14.6-3.625-6.375.
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(1)24×
+76×
,
=
×(76+24),
=
×100,
=50;
(2)87.5÷12.5÷8,
=87.5÷(12.5×8),
=87.5÷100,
=0.875;
(3(
+
)÷
,
=
×8+
×8,
=7+6,
=13;
(4)91+91×(
-
),
=91+91×
-91×
,
=91+14-13,
=92;
(5)2.2×101,
=2.2×(100+1),
=2.2×100+2.2×1,
=220+2.2,
=222.2;
(6)14.6-3.625-6.375,
=14.6-(3.625+6.375),
=14.6-10,
=4.6.
1 |
2 |
1 |
2 |
=
1 |
2 |
=
1 |
2 |
=50;
(2)87.5÷12.5÷8,
=87.5÷(12.5×8),
=87.5÷100,
=0.875;
(3(
7 |
8 |
3 |
4 |
1 |
8 |
=
7 |
8 |
3 |
4 |
=7+6,
=13;
(4)91+91×(
2 |
13 |
1 |
7 |
=91+91×
2 |
13 |
1 |
7 |
=91+14-13,
=92;
(5)2.2×101,
=2.2×(100+1),
=2.2×100+2.2×1,
=220+2.2,
=222.2;
(6)14.6-3.625-6.375,
=14.6-(3.625+6.375),
=14.6-10,
=4.6.
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