题目内容

用多喜欢的方法计算
①71b-1i×4
②了.4÷1i+12
1
3
÷
1
×
9
1b

④2.2了×4.i+77.了×b.4i.
①550-58×4,
=550-52,
=手38;
&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;&0b5p;
②5.4÷58+52,
=0.3+52,
=52.3;

5
3
÷
5
5
×
9
50

=
5
3
×5×
9
50

=
3
2


④2.25×4.8+55.5×0.48,
=2.25×4.8+5.55×4.8,
=(2.25+5.55)×4.8,
=50×4.8,
=48.
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