计算下面各题,能简算的要简算.①4.28-1.39-2.61②7.2×0.3+0.3×0.8③0.4×3.14×2.5④9.4×[3.6÷(5.4÷0.9)]⑤840÷(0.23+0.37)÷7⑥23

题目简介

计算下面各题,能简算的要简算.①4.28-1.39-2.61②7.2×0.3+0.3×0.8③0.4×3.14×2.5④9.4×[3.6÷(5.4÷0.9)]⑤840÷(0.23+0.37)÷7⑥23

题目详情

计算下面各题,能简算的要简算.
①4.28-1.39-2.61②7.2×0.3+0.3×0.8③0.4×3.14×2.5④9.4×[3.6÷(5.4÷0.9)]
⑤840÷(0.23+0.37)÷7⑥23.7╳1.25╳8⑦12.5×102⑧9.1+0.9╳(22-18.7)
题型:解答题难度:中档来源:不详

答案

(1)4.28-1.39-2.61,
=4.28-(1.39+2.61),
=4.28-4,
=0.28;

(2)7.2×0.3+0.3×0.8,
=(7.2+0.8)×0.3,
=8×0.3,
=2.4;

(3)0.4×3.14×2.5,
=0.4×2.5×3.14,
=1×3.14,
=3.14;

(4)9.4×[3.6÷(5.4÷0.9)]
=9.4×[3.6÷6],
=9.4×0.6,
=5.64;

(5)840÷(0.23+0.37)÷7,
=840÷0.6÷7,
=1400÷7,
=200;

(6)23.7╳1.25╳8,
=23.7×(1.25×8),
=23.7×10,
=237;

(7)12.5×102,
=12.5×(100+2),
=12.5×100+12.5×2,
=1250+25,
=1275;

(8)9.1+0.9╳(22-18.7),
=9.1+0.9×3.3,
=9.1+2.97,
=12.07.

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