递等式计算.(能简算的要简算)(1)125×16×25(2)72×102-2×72(3)25+25×39(4)(125+16)×8(
递等式计算.(能简算的要简算)(1)125×16×25(2)72×102-2×72(3)25+25×39(4)(125+16)×8(5)37×25+268÷67(6)49...
递等式计算.(能简算的要简算)(1)125×16×25(2)72×102-2×72(3)25+25×39(4)(125+16)×8(5)37×25+268÷67(6)49×[300-(94+58)].
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(1)125×16×25
=125×8×2×25
=(125×8)×(2×25)
=1000×50
=50000;
(2)72×102-2×72
=72×(102-2)
=72×100
=7200;
(3)25+25×39
=25×(1+39)
=25×40
=1000;
(4)(125+16)×8
=125×8+16×8
=1000+128
=1128;
(5)37×25+268÷67
=925+4
=929;
(6)49×[300-(94+58)]
=49×[300-152]
=49×148
=7252.
=125×8×2×25
=(125×8)×(2×25)
=1000×50
=50000;
(2)72×102-2×72
=72×(102-2)
=72×100
=7200;
(3)25+25×39
=25×(1+39)
=25×40
=1000;
(4)(125+16)×8
=125×8+16×8
=1000+128
=1128;
(5)37×25+268÷67
=925+4
=929;
(6)49×[300-(94+58)]
=49×[300-152]
=49×148
=7252.
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