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) |
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.
分析:完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的方法進(jìn)行簡(jiǎn)算.
點(diǎn)評(píng):
在簡(jiǎn)算過(guò)程中,增添括號(hào)或去掉括號(hào)時(shí)要注意運(yùn)算符號(hào)的改變. |
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