脱式计算.(能简便的要用简便方法算) 4.2+7.64+5.8+2.3614.28-2.63-7.376.8+5.26+3.74+3.28.2×101-8.2
脱式计算.(能简便的要用简便方法算)4.2+7.64+5.8+2.3614.28-2.63-7.376.8+5.26+3.74+3.28.2×101-8.2(520+48...
脱式计算.(能简便的要用简便方法算) 4.2+7.64+5.8+2.3614.28-2.63-7.376.8+5.26+3.74+3.28.2×101-8.2(520+480)÷50×4400-(1300÷65+35)
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(1)4.2+7.64+5.8+2.36,
=(4.2+5.8)+(7.64+2.36),
=10+10,
=20;
(2)14.28-2.63-7.37,
=14.28-(2.63+7.37),
=14.28-10,
=4.28;
(3)6.8+5.26+3.74+3.2,
=(6.8+3.2)+(5.26+3.74),
=10+9,
=19;
(4)8.2×101-8.2,
=8.2×(101-1),
=8.2×100,
=820;
(5)(520+480)÷50×4,
=1000÷50×4,
=20×4,
=80;
(6)400-(1300÷65+35),
=400-(20+35),
=400-55,
=345.
=(4.2+5.8)+(7.64+2.36),
=10+10,
=20;
(2)14.28-2.63-7.37,
=14.28-(2.63+7.37),
=14.28-10,
=4.28;
(3)6.8+5.26+3.74+3.2,
=(6.8+3.2)+(5.26+3.74),
=10+9,
=19;
(4)8.2×101-8.2,
=8.2×(101-1),
=8.2×100,
=820;
(5)(520+480)÷50×4,
=1000÷50×4,
=20×4,
=80;
(6)400-(1300÷65+35),
=400-(20+35),
=400-55,
=345.
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