能簡算的用簡便方法算.
9.28+1.82÷0.7
(71.2-71.2×0.9)÷0.25 6.5×2.3+6.5×6.7+6.5
7.8÷0.25÷4 1.37×99+1.37 4.8×6.2-12.4.
分析:(1)先算除法,再算加法;
(2)先把小括號里面的運(yùn)算按照乘法分配律簡算,再算括號外的除法;
(3)(5)運(yùn)用乘法分配律簡算;
(4)根據(jù)除法的性質(zhì)簡算;
(6)先算乘法,再算減法.
解答:解:(1)9.28+1.82÷0.7,
=9.28+2.6,
=11.88;

(2)(71.2-71.2×0.9)÷0.25,
=(1-0.9)×71.2÷0.25,
=0.1×71.2÷0.25,
=7.12÷0.25,
=28.48;

(3)6.5×2.3+6.5×6.7+6.5,
=6.5×(2.3+6.7+1),
=6.5×10,
=65;

(4)7.8÷0.25÷4,
=7.8÷(0.25×4),
=7.8÷1,
=7.8;

(5)1.37×99+1.37,
=1.37×(99+1),
=1.37×100,
=137;

(6)4.8×6.2-12.4,
=29.76-12.4,
=17.36.
點(diǎn)評:完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡便方法計算.
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