计算下面各题. 5.4×102 23.7×0.25×8 4.2+3.6÷60 4.8÷0.24÷2 0.7+3.9+4.3+6.1 0.8
计算下面各题.5.4×10223.7×0.25×84.2+3.6÷604.8÷0.24÷20.7+3.9+4.3+6.10.8×[13-(3.12+5.28)]....
计算下面各题. 5.4×102 23.7×0.25×8 4.2+3.6÷60 4.8÷0.24÷2 0.7+3.9+4.3+6.1 0.8×[13-(3.12+5.28)].
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(1)5.4×102,
=5.4×(100+2),
=5.4×100+5.4×2,
=540+10.8,
=550.8;
(2)23.7×0.25×8,
=23.7×(0.25×8),
=23.7×2,
=47.4;
(3)4.2+3.6÷60,
=4.2+0.06,
=4.26;
(4)4.8÷0.24÷2,
=4.8÷(0.24×2),
=4.8÷0.48,
=10;
(5)0.7+3.9+4.3+6.1,
=(0.7+4.3)+(3.9+6.1),
=5+10,
=15;
(6)0.8×[13-(3.12+5.28)],
=0.8×[13-8.4],
=0.8×4.6,
=3.68.
=5.4×(100+2),
=5.4×100+5.4×2,
=540+10.8,
=550.8;
(2)23.7×0.25×8,
=23.7×(0.25×8),
=23.7×2,
=47.4;
(3)4.2+3.6÷60,
=4.2+0.06,
=4.26;
(4)4.8÷0.24÷2,
=4.8÷(0.24×2),
=4.8÷0.48,
=10;
(5)0.7+3.9+4.3+6.1,
=(0.7+4.3)+(3.9+6.1),
=5+10,
=15;
(6)0.8×[13-(3.12+5.28)],
=0.8×[13-8.4],
=0.8×4.6,
=3.68.
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