0.5×1.2=1.25×0.8=0.16×0.5=
0.25×4=3.2×0.5=0.2×50=
1.1×0.1=1.7×0.03=2.4×0.5=
0.12×7=

解:

0.5×1.2=0.6,1.25×0.8=1,0.16×0.5=0.08,
0.25×4=1,3.2×0.5=1.5,0.2×50=10,
1.1×0.1=0.11,1.7×0.03=0.051,2.4×0.5=1.2,
0.12×7=0.84.

分析:根據(jù)小數(shù)乘法的計(jì)算方法進(jìn)行計(jì)算.
點(diǎn)評(píng):口算時(shí),注意運(yùn)算符號(hào)和數(shù)據(jù),然后再進(jìn)一步計(jì)算.
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