用递等式计算. (1)35+180÷20+10 (2)(43+17)÷(36÷6) (3)(220+120)÷(20-16) (4)210÷7×22×5.
(1)35+180÷20+10,
=35+9+10,
=44+10,
=54;
(2)(43+17)÷(36÷6),
=60÷6,
=10;
(3)(220+120)÷(20-16),
=340÷4,
=85;
(4)210÷7×22×5,
=30×22×5,
=660×5,
=3300.
=35+9+10,
=44+10,
=54;
(2)(43+17)÷(36÷6),
=60÷6,
=10;
(3)(220+120)÷(20-16),
=340÷4,
=85;
(4)210÷7×22×5,
=30×22×5,
=660×5,
=3300.
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