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0.89×0.48+0.89×0.52 0.25×13.7×0.4 4.2×101
3.6×99 2.5×32×1.25 0.125×88
56.5×99+56.5 (1.25-0.125)×8 45÷0.09÷0.5
17.8÷(1.78×4)
分析:完成本题要注意分析式中数据,运用合适的方法进行简算.
解答:解:0.89×4.8+0.89×0.52
=(0.48+0.52)×0.89,
=1×0.89,
=0.89;

0.25×13.7×0.4
=0.25×0.4×13.7,
=0.1×13.7,
=1.37;

4.2×101
=4.2×100+4.2,
=420+4.2,
=424.2;

3.6×99
=3.6×100-3.6,
=360-3.6,
=356.4;

2.5×32×1.25
=(2.5×4)×(1.25×8),
=10×10,
=100;

0.125×88
=0.125×8×11,
=1×11,
=11;

56.5×99+56.5
=(99+1)×56.5,
=100×56.5,
=5650;

(1.25-0.125)×8
=1.25×8-0.125×8,
=10-1,
=9;

45÷0.09÷0.5
=45÷(0.09×0.5),
=1000;

17.8÷(1.78×4)
=17.8÷1.78÷4,
=2.5.
点评:
在简算过程中,增添括号或去掉括号时要注意运算符号的改变.
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