452÷20+109×43=101×92-92=907×99+907=274+299+201+326=6.5×99+6.5=31.25÷25×0.5=3.8×4.2+38×0.58=13-78+18=(12+13+16)×2×3×4=37×(45-23)÷315=36÷[(56-23)×3]=18÷(14+2.5×45)=
452÷20+109×43= | 101×92-92= | 907×99+907= |
274+299+201+326= | 6.5×99+6.5= | 31.25÷25×0.5= |
3.8×4.2+38×0.58= | 13-+= | (++)×2×3×4= |
×(-)÷= | 36÷[(-)×3]= | ÷(+2.5×)= |
答案和解析
(1)452÷20+109×43
=22.6+4687,
=4709.6;
(2)101×92-92,
=(101-1)×92,
=100×92,
=9200;
(3)907×99+907,
=(99+1)×907,
=100×907,
=90700;
(4)274+299+201+326,
=(274+326)+(299+201),
=600+500,
=1100;
(5)6.5×99+6.5,
=(99+1)×6.5,
=100×6.5,
=650;
(6)31.25÷25×0.5,
=1.25÷0.5,
=2.5;
(7)3.8×4.2+38×0.58
=38×0.42+38×0.58
=(0.42+0.58)×38,
=1×0.38,
=38;
(8)13-
+
=12+,
=12;
(9)(++)×2×3×4
=(++)×24,
=×24+×24+×24,
=12+8+4,
=24;
(10)×(-)÷
=×(×-×),
=×(-),
=×,
=
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