题目内容

简便运算。
(1)2.5×7.2÷(0.9÷4) (2)4.2×0.34÷(1.4×0.34)
(3)1÷32÷0.05÷0.25÷0.5 (4)1.25×5.6+2.25×3.6
(1)原式=2.5×4×(7.2÷0.9)
                =10×8
                =80
(2)原式= 4.2÷1.4×(0.34÷0.34)
                =3×1
                =3
(3)原式=1÷(32×0.05×0.25×0.5)
                =1÷0.2
                =5
(4)原式=1.25×8×0.7+2.25×4×0.9
                =10×0.7+9×0.9
                =15.1
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