问题
解答题
脱式计算(用你自己喜欢的方法)
①1.12+1.79+8.88+0.21
②73.2-16.3-3.7
③99×3.6+3.6
④7.9×0.8×0.125
⑤4×8.8×0.25
⑥0.36×101.
答案
(1)1.12+1.79+8.88+0.21,
=(1.12+8.88)+(1.79+0.21),
=10+2,
=12;
(2)73.2-16.3-3.7
=73.2-(16.3+3.7),
=73.2-20,
=53.2;
(3)99×3.6+3.6,
=(99+1)×3.6,
=100×3.6,
=360;
(4)7.9×0.8×0.125
=7.9×(0.8×0.125),
=7.9×0.1,
=0.79;
(5)4×8.8×0.25,
=4×0.25×8.8,
=1×8.8,
=8.8;
(6)0.36×101,
=0.36×(100+1),
=0.36×100+0.36×1,
=36+0.36,
=36.36.