计算下面各题.(能简算的要简算)(1)24×12+76×12 (2)87.5÷12.5÷8 (3)(78+34)÷18 (4)9

2024年11月22日 10:07
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(1)24×

1
2
+76×
1
2

=
1
2
×(76+24),
=
1
2
×100,
=50;

(2)87.5÷12.5÷8,
=87.5÷(12.5×8),
=87.5÷100,
=0.875;

(3(
7
8
+
3
4
)÷
1
8

=
7
8
×8+
3
4
×8,
=7+6,
=13;

(4)91+91×(
2
13
-
1
7
),
=91+91×
2
13
-91×
1
7

=91+14-13,
=92;

(5)2.2×101,
=2.2×(100+1),
=2.2×100+2.2×1,
=220+2.2,
=222.2;

(6)14.6-3.625-6.375,
=14.6-(3.625+6.375),
=14.6-10,
=4.6.