简便计算.0.28×1020.175÷0.25÷0.47.09×9.2+0.8×7.0911.8-2.08-3.724.
1个回答

(1)0.28×102,

=0.28×(100+2),

=0.28×100+0.28×2,

=28+0.56,

=28.56;

(2)0.175÷0.25÷0.4,

=0.175÷(0.25×0.4),

=0.175÷0.1,

=1.75;

(3)7.09×9.2+0.8×7.09,

=7.09×(9.2+0.8),

=7.09×10,

=70.9;

(4)11.8-2.08-3.72,

=11.8-(2.08+3.72),

=11.8-5.8,

=6;

(5)4.8×0.2×0.5,

=4.8×(0.2×0.5),

=4.8×0.1,

=0.48;

(6)3.72×3.5+6.28×3.5,

=(3.72+6.28)×3.5,

=10×3.5,

=35.