题目内容
计算下面各题,怎样简便就怎样算.
| (1)45.36÷7.2-2.5×0.2 | (2)5.12-(4.65-4.88) |
| (3)2.7÷4+6.3×0.5 | (4)9.43×1.1 |
| (5)0.25×12.5×3.2 | (6)30.8×0.35+6.5×3.08. |
(1)45.36÷7.2-2.5×0.2,
=6.3-0.5,
=5.8;
(2)5.12-(4.65-4.88),
=5.12-4.65+4.88,
=(5.12+4.68)-4.65,
=10-4.65,
=5.35;
(3)2.7÷4+6.3×0.5,
=0.675+3.15,
=3.825;
(4)9.43×1.1,
=9.43×(1+0.1),
=9.43+0.943,
=14.198;
(5)0.25×12.5×3.2,
=0.25×12.5×0.8×4,
=(0.25×4)×(12.5×0.8),
=1×10,
=10;
(6)30.8×0.35+6.5×3.08,
=3.08×3.5+6.5×3.08,
=3.08×(3.5+6.5),
=3.08×10,
=30.8.
=6.3-0.5,
=5.8;
(2)5.12-(4.65-4.88),
=5.12-4.65+4.88,
=(5.12+4.68)-4.65,
=10-4.65,
=5.35;
(3)2.7÷4+6.3×0.5,
=0.675+3.15,
=3.825;
(4)9.43×1.1,
=9.43×(1+0.1),
=9.43+0.943,
=14.198;
(5)0.25×12.5×3.2,
=0.25×12.5×0.8×4,
=(0.25×4)×(12.5×0.8),
=1×10,
=10;
(6)30.8×0.35+6.5×3.08,
=3.08×3.5+6.5×3.08,
=3.08×(3.5+6.5),
=3.08×10,
=30.8.
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