脱式计算,能简便的就简便4.2×99+4.2 0.25×32×12.5 ...
答案:1 悬赏:40
解决时间 2021-03-29 13:36
- 提问者网友:谁的错
- 2021-03-28 17:29
脱式计算,能简便的就简便4.2×99+4.2 0.25×32×12.5 ...
最佳答案
- 二级知识专家网友:冷風如刀
- 2021-03-28 17:55
(1)4.2×99+4.2,
=(99+1)×4.2,
=100×4.2,
=420;
(2)0.25×32×12.5,
=0.25×4×8×12.5,
=0.25×4×(8×12.5),
=1×100,
=100;
(3)21.4-1.4×1.5,
=21.4-0.7×(2×1.5),
=21.4-0.7×3,
=21.4-2.1,
=19.3;
(4)(40-0.8×4)÷0.4,
=(40-3.2)÷0.4,
=40÷0.4-3.2÷0.4,
=100-8,
=92;
(5)56×10.1,
=56×(10+0.1),
=56×10+56×0.1,
=560+5.6,
=565.6;
(6)9.8÷2.5÷0.4,
=9.8÷(2.5×0.4),
=9.8÷1,
=9.8.
=(99+1)×4.2,
=100×4.2,
=420;
(2)0.25×32×12.5,
=0.25×4×8×12.5,
=0.25×4×(8×12.5),
=1×100,
=100;
(3)21.4-1.4×1.5,
=21.4-0.7×(2×1.5),
=21.4-0.7×3,
=21.4-2.1,
=19.3;
(4)(40-0.8×4)÷0.4,
=(40-3.2)÷0.4,
=40÷0.4-3.2÷0.4,
=100-8,
=92;
(5)56×10.1,
=56×(10+0.1),
=56×10+56×0.1,
=560+5.6,
=565.6;
(6)9.8÷2.5÷0.4,
=9.8÷(2.5×0.4),
=9.8÷1,
=9.8.
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