题目内容
脱式计算(能简便算的要简便算)
| (1)89.3×43+38×89.3+893×1.9 | (2)10.01×101-10.01 | (3)4.75×17.5+2.5×4.75 |
| (4)1.25×32×0.25 | (5)0.22×1.5+1.541÷2.3 | (6)(5.15-3.25)×0.4+0.36. |
(1)89.3×43+38×89.3+893×1.9,
=89.3×43+38×89.3+89.3×19,
=89.3×(43+38+19),
=89.3×100,
=8930;
(2)10.01×101-10.01,
=10.01×(101-1),
=10.01×100,
=1001;
(3)4.75×17.5+2.5×4.75,
=4.75×(17.5+2.5),
=4.75×20,
=95;
(4)1.25×32×0.25,
=1.25×8×4×0.25,
=(1.25×8)×(4×0.25),
=10×1,
=10;
(5)0.22×1.5+1.541÷2.3,
=0.33+0.67,
=1;
(6)(5.15-3.25)×0.4+0.36,
=1.9×0.4+0.36,
=0.76+0.36,
=1.12.
=89.3×43+38×89.3+89.3×19,
=89.3×(43+38+19),
=89.3×100,
=8930;
(2)10.01×101-10.01,
=10.01×(101-1),
=10.01×100,
=1001;
(3)4.75×17.5+2.5×4.75,
=4.75×(17.5+2.5),
=4.75×20,
=95;
(4)1.25×32×0.25,
=1.25×8×4×0.25,
=(1.25×8)×(4×0.25),
=10×1,
=10;
(5)0.22×1.5+1.541÷2.3,
=0.33+0.67,
=1;
(6)(5.15-3.25)×0.4+0.36,
=1.9×0.4+0.36,
=0.76+0.36,
=1.12.
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