题目内容
| 脱式计算,能简算的要简算 (1)0.26×2.5+0.74×2.5-2.5 | (2)0.25×12.5×1.6 |
| (3)17.64÷4.9+6.73 | (4)10.1×87 |
(1)0.26×2.5+0.74×2.5-2.5
=(0.26+0.74-1)×2.5
=0×2.5
=0;
(2)0.25×12.5×1.6
=0.25×12.5×8×0.2
=(0.25×0.2)×(12.5×8)
=0.05×100
=5;
(3)17.64÷4.9+6.73
=3.6+6.73
=10.33;
(4)10.1×87
=(10+0.1)×87
=10×87+0.1×87
=870+8.7
=878.7.
=(0.26+0.74-1)×2.5
=0×2.5
=0;
(2)0.25×12.5×1.6
=0.25×12.5×8×0.2
=(0.25×0.2)×(12.5×8)
=0.05×100
=5;
(3)17.64÷4.9+6.73
=3.6+6.73
=10.33;
(4)10.1×87
=(10+0.1)×87
=10×87+0.1×87
=870+8.7
=878.7.
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