递等式计算.[能简算的要简便计算].197-12×9+61 ...
递等式计算.[能简算的要简便计算].197-12×9+6138+160÷(40-30)(234-195)×12÷2678×15+22×1525×68×4101×2338×...
递等式计算.[能简算的要简便计算].197-12×9+61 38+160÷(40-30)(234-195)×12÷2678×15+22×15 25×68×4 101×23 38×99+38.
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(1)197-12×9+61
=197-108+61
=89+61
=150;
(2)38+160÷(40-30)
=38+160÷10
=38+16
=54;
(3)(234-195)×12÷26
=39×12÷26
=468×26
=18;
(4)78×15+22×15
=(78+22)×15
=100×15
=1500;
(5)25×68×4
=25×4×68
=100×68
=6800;
(6)101×23
=(100+1)×23
=100×23+1×23
=2300+23
=2323;
(7)38×99+38
=38×(99+1)
=38×100
=3800.
=197-108+61
=89+61
=150;
(2)38+160÷(40-30)
=38+160÷10
=38+16
=54;
(3)(234-195)×12÷26
=39×12÷26
=468×26
=18;
(4)78×15+22×15
=(78+22)×15
=100×15
=1500;
(5)25×68×4
=25×4×68
=100×68
=6800;
(6)101×23
=(100+1)×23
=100×23+1×23
=2300+23
=2323;
(7)38×99+38
=38×(99+1)
=38×100
=3800.
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