计算下面各题(能简算的要简算).?
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解题思路:(1)先算小括号里面的除法,再算小括号里面的减法,最后算括号外的乘法;
(2)先算小括号里面的减法,再把24分解成8×3,运用乘法结合律简算,最后算除法;
(3)先把44分解成4×11,再运用乘法结合律简算;
(4)运用乘法交换律简算;
(5)先把9.9分解成10-0.1,再运用乘法分配律简算;
(6)运用乘法分配律简算.
(1)0.85×(21.9-7.6÷4),
=0.85×(21.9-1.9),
=0.85×20,
=17;
(2)(15-13.75)×24÷2.5,
=1.25×24÷2.5,
=1.25×8×3÷2.5,
=10×3÷2.5,
=30÷2.5,
=12;
(3)2.5×44,
=2.5×4×11,
=10×11,
=110;
(4)12.5×17.8×0.8,
=12.5×0.8×17.8,
=10×17.8,
=178;
(5)9.9×5.4,
=(10-0.1)×5.4,
=10×5.4-0.1×5.4,
=54-0.54,
=53.46;
(6)9.4×5.8+10.6×5.8,
=(9.4+10.6)×5.8,
=20×5.8,
=116.
,10,计算下面各题(能简算的要简算).
0.85×(21.9-7.6÷4)
(15-13.75)×24÷2.5 2.5×44 12.5×17.8×0.8 9.9×5.4 9.4×5.8+10.6×5.8.
(2)先算小括号里面的减法,再把24分解成8×3,运用乘法结合律简算,最后算除法;
(3)先把44分解成4×11,再运用乘法结合律简算;
(4)运用乘法交换律简算;
(5)先把9.9分解成10-0.1,再运用乘法分配律简算;
(6)运用乘法分配律简算.
(1)0.85×(21.9-7.6÷4),
=0.85×(21.9-1.9),
=0.85×20,
=17;
(2)(15-13.75)×24÷2.5,
=1.25×24÷2.5,
=1.25×8×3÷2.5,
=10×3÷2.5,
=30÷2.5,
=12;
(3)2.5×44,
=2.5×4×11,
=10×11,
=110;
(4)12.5×17.8×0.8,
=12.5×0.8×17.8,
=10×17.8,
=178;
(5)9.9×5.4,
=(10-0.1)×5.4,
=10×5.4-0.1×5.4,
=54-0.54,
=53.46;
(6)9.4×5.8+10.6×5.8,
=(9.4+10.6)×5.8,
=20×5.8,
=116.
,10,计算下面各题(能简算的要简算).
0.85×(21.9-7.6÷4)
(15-13.75)×24÷2.5 2.5×44 12.5×17.8×0.8 9.9×5.4 9.4×5.8+10.6×5.8.
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