脱式计算(能箭算的要箭算) 6.5×8+3.5×8-44 138×99 (999+111)÷[56×(37-38)] (1.9+1.9+1.
脱式计算(能箭算的要箭算)6.5×8+3.5×8-44138×99(999+111)÷[56×(37-38)](1.9+1.9+1.9+1.9)×2.5[2-(11.9-...
脱式计算(能箭算的要箭算) 6.5×8+3.5×8-44 138×99 (999+111)÷[56×(37-38)] (1.9+1.9+1.9+1.9)×2.5 [2-(11.9-8.4×113)]÷1.3.
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(1)6.5×8+3.5×8-44,
=(6.5+3.5)×8-44,
=10×8-44,
=80-44,
=36;
(2)138×99,
=138×(100-1),
=138×100-138×1,
=13800-138,
=13662;
(3)(999+111)÷[56×(
-
)],
=1110÷[56×
-56×
],
=1110÷[24-21],
=1110÷3,
=370;
(4)(1.9+1.9+1.9+1.9)×2.5,
=1.9×4×2.5,
=1.9×(4×2.5),
=1.9×10,
=19;
(5)[2-(11.9-8.4×1
)]÷1.3,
=[2-(11.9-11.2)]÷1.3,
=[2-0.7]÷1.3,
=1.3÷1.3,
=1.
=(6.5+3.5)×8-44,
=10×8-44,
=80-44,
=36;
(2)138×99,
=138×(100-1),
=138×100-138×1,
=13800-138,
=13662;
(3)(999+111)÷[56×(
3 |
7 |
3 |
8 |
=1110÷[56×
3 |
7 |
3 |
8 |
=1110÷[24-21],
=1110÷3,
=370;
(4)(1.9+1.9+1.9+1.9)×2.5,
=1.9×4×2.5,
=1.9×(4×2.5),
=1.9×10,
=19;
(5)[2-(11.9-8.4×1
1 |
3 |
=[2-(11.9-11.2)]÷1.3,
=[2-0.7]÷1.3,
=1.3÷1.3,
=1.
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