问题
解答题
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答案
(1)49×49+49,
=49×(49+1),
=49×50,
=2450;
(2)(24×15-290)÷5,
=(24×5×3-290)÷5,
=(360-290)÷5,
=70÷5,
=14;
(3)271×24-24×171,
=(271-171)×24,
=100×24,
=2400;
(4)88×125,
=(8×11)×125,
=8×125×11,
=1000×11,
=11000;
(5)32×[168-(89+43)],
=32×[168-132],
=32×36,
=1152;
(6)1200÷25,
=(1200×4)÷(25×4),
=4800÷100,
=48;
(7)101×32,
=(100+1)×32,
=100×32+32,
=3200+32,
=3232.